Geological map of the state of Pennsylvania : constructed from original surveys made between 1836 and 1857 /

Relief shown by hachures.
"To accompany the final report on the Geological Survey of the state 1858."
"Entered according to act of Congress, in the year 1858, by Henry D. Rogers ... Eastern District of Pennsylvania."
Washington D.C. meridian.
LC copies variously torn, taped, and fold-lined.
Available also through the Library of Congress Web site as a raster image.
3 copies
Vault