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H. Doc. 66-403 - Catalogue of the Mesozoic and Cenozoic plants of North America, by F.H. Knowlton. [U.S. Geological Survey Bulletin 696.]
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U.S. Congress. House of Representatives. Catalogue of the Mesozoic and Cenozoic plants of North America, by F.H. Knowlton. [U.S. Geological Survey Bulletin 696.]. 66th Cong., 2nd sess., 1920. 66-403. https://www.govinfo.gov/app/details/SERIALSET-07709_00_00-002-0403-0000.
House of Representatives, Congress. (1920, January 1). H. Doc. 66-403 - Catalogue of the Mesozoic and Cenozoic plants of North America, by F.H. Knowlton. [U.S. Geological Survey Bulletin 696.]. [Government]. U.S. Government Printing Office. https://www.govinfo.gov/app/details/SERIALSET-07709_00_00-002-0403-0000
House of Representatives, Congress. H. Doc. 66-403 - Catalogue of the Mesozoic and Cenozoic plants of North America, by F.H. Knowlton. [U.S. Geological Survey Bulletin 696.]. U.S. Government Printing Office, (1 Jan 1920), https://www.govinfo.gov/app/details/SERIALSET-07709_00_00-002-0403-0000
House of Representatives, Congress, Catalogue of the Mesozoic and Cenozoic plants of North America, by F.H. Knowlton. [U.S. Geological Survey Bulletin 696.], GovInfo, (January 1, 1920), https://www.govinfo.gov/app/details/SERIALSET-07709_00_00-002-0403-0000