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  1. 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
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