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  1. By: Cooper, G. Arthur (Gustav Arthur),
    Publication info: 1965
    Holding Institution: Smithsonian Institution Archives
    Subjects: Dromgold  Field notes  Geology  Paleontology  Pennsylvania  United States
    BHL Collections: Smithsonian Field Books collection
  2. By: Cooper, G. Arthur (Gustav Arthur),
    Publication info: 1965
    Holding Institution: Smithsonian Institution Archives
    Subjects: Dromgold  Field notes  Geology  Paleontology  Pennsylvania  Slides (photographs)  United States  
    BHL Collections: Smithsonian Field Books collection