Dan Clement

Significance: Using steel frame construction and sheathed in brick and glass, the American Locomotive Company's Foundry building is a typical example of 20th century industrial architecture. Survey number: HAE More

Significance: This 1,800,000 bushel (2,250,000 cubic feet) capacity grain storage facility was originally built as part of the New York State Barge Canal system. It comprises 120 circular reinforced concrete b More

Significance: La Guardia Airport's Marine Air Terminal is one of the only surviving examples of terminals built especially for the service of "Clipper Ships," sea planes that routinely made Trans-Atlantic cross More

Significance: Representative example of a turn of the century high steel trestle. This trestle was built on the last major section of the present Long Island Railroad. Survey number: HAER NY-81 Building/stru More

Significance: Representative example of steam powered textile mills built in Manayunk after the Civil War. Survey number: HAER PA-73 Building/structure dates: 1882 Initial Construction

Significance: The lighthouse at Sands Point is a representative example masonry lighthouse construction in the early 19th century. It is also an example of the many lighthouses that have aided navigation in and More

Significance: The train station at Stoughton is one of the last remaining towered stations built in Massachusetts by the railroads during the late 19th and early 20th century. It is also the first and probably More

Significance: The Blackstone canal was one of the regions first long distance transportation systems. It was one of the waterways that helped to spawn the industrial development that took place in the Blacksto More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: Locks 39-43 near Boonevill are typical of the 109 locks that comprised the 25 miles of the Black River Canal. A feeder to the Erie Canal, the Black River Canal remained in use until 1923 and outl More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d More

Significance: The Pratt Insititute Power Plant contains three direct current generators built by General Electric that are directly connected with three horizontal reciprocating steam engines manufactured by th More

Significance: The Pratt Insititute Power Plant contains three direct current generators built by General Electric that are directly connected with three horizontal reciprocating steam engines manufactured by th More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: Speicher Bridge, a rural iron highway bridge, is a good example from the important mid-19th century era of metal bridge technology. Unprocessed Field note material exists for this structure: FN-7 More

Significance: The station at Atlanta is a representative example of the "combination" station (one that has the ability to service both freight and passengers separately under the same roof). This station is v More

Significance: The station at Atlanta is a representative example of the "combination" station (one that has the ability to service both freight and passengers separately under the same roof). This station is v More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: In the late 19th century the city of Providence began filling in its tidal basin and undertook construction of a new Union Station Complex. A viaduct, utilizing a series of box-girder bridges, wa More

Significance: The Potomac Aqueduct was an important component in the integrated canal system serving the Potomac River watershed. Built during a major expansion in America's long distance transportation system More

Significance: The Potomac Aqueduct was an important component in the integrated canal system serving the Potomac River watershed. Built during a major expansion in America's long distance transportation system More

Significance: The Potomac Aqueduct was an important component in the integrated canal system serving the Potomac River watershed. Built during a major expansion in America's long distance transportation system More