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On the fossil foot-marks in the red sandstone of Pottsville, Pennsylvania / by Isaac Lea.
By: Lea, Isaac, - American Philosophical Society.
Publication info: Philadelphia :Printed for the author,1852.
Contributed by: Harvard University, MCZ, Ernst Mayr Library
Subjects: Dinosaurs Footprints, Fossil Paleontology Pennsylvania Pottsville
BHL Collections: Ernst Mayr Library of the MCZ, Harvard University