State of Pennsylvania Historic map, Library of Congress

Scale 1:500,000; 1 in. equals approx. 8 miles.
Alternate title in lower margin: Pennsylvania, base map with highways and contours.
"Lambert conformal conic projection."
Relief shown by contours and spot heights.
In bottom margin: 1975.
Available also through the Library of Congress Web site as a raster image.
AACR2