Contributions to the geology and paleontology of the Canal Zone, Panama, and geologically related areas in Central America and the West Indies Vaughan, Thomas Wayland, 1870-1952 creator United States National Museum contributor text book Washington Govt. Print. Off 1919 1919
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ENG Canal Zone Paleontology Panama Tertiary QE216 .V36 1919 Bulletin (United States National Museum), no. 103 https://www.biodiversitylibrary.org/bibliography/169510 https://www.biodiversitylibrary.org/bibliography/15815 2969223 10.5962/bhl.title.15815 VMC