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  1. By: Lea, Isaac, - American Philosophical Society.
    Publication info: Philadelphia, Printed for the author, 1852
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Dinosaurs  Footprints, Fossil  Paleontology  Pennsylvania  Pottsville  
  2. By: Lea, Isaac, - American Philosophical Society.
    Publication info: Philadelphia, Printed for the author, 1852
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Footprints, Fossil  Paleontology  Pennsylvania  Pottsville  
    BHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection