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4Published 1916“...Geological Survey professional paper 91; Lower Eocene floras of southeastern North America...”
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9Published 1920Table of Contents: “...A. An Eocene flora from trans-Pecos, Texas -- B. Gradations from continental to marine conditions...”
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10by Walker, A. H., Cory, V. L., 1880-1964, Parks, H. B. (Harris Braley), 1879-1958, Sperry, Omer EdisonAvailable online via OAK Trust Repository
Published 1949
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