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Summary
Concrete had to be poured and smoothed by hand. Every piece of construction material had to be carried in through the portal tunnel, and then by hand through the tour route.
Tags
jewel cave national monument
custer county
south dakota
picasa
concrete paths
hand
tour route
national parks gallery
ultra high resolution
high resolution
Date
2014
Location
Source
National Parks Gallery
Link
Copyright info
Public Domain Dedication