Books by Robert Smith LaMotte:
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LaMotte, Robert Smith, 1895-: Middle Cenozoic Floras of Western North America (Contributions to Palaeontology; Carnegie Institution of Washington publication #455; 1936), also by Elizabeth Oliver (page images at HathiTrust)
Additional books by Robert Smith LaMotte in the extended shelves:
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LaMotte, Robert Smith, 1895-: Supplement to catalogue of Mesozoic and Cenozoic plants of North America, 1919-37 (U.S. Govt. Print. Off., 1944), also by Frank Hall Knowlton and Geological Survey (U.S.) (page images at HathiTrust)
Find more by Robert Smith LaMotte at your library, or elsewhere.