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."
Originally published in 4 sheets.
"Entered according to act of Congress, in the year 1858, by Henry D. Rogers ... Eastern District of Pennsylvania."
Washington D.C. meridian.
Includes numerous black-and-white cross-sections.
LC copy sectioned to 45 panels.
Available also through the Library of Congress Web site as a raster image.
Vault