The Characteristic Plants of a Typical Prairie
Schaffner, John H. pp. 65-69
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The Classification of Plants, VIII.
Schaffner, John H. pp. 70-78
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Additions Made to the Cedar Point Flora During the Summer of 1912
Fullmer, E. L. p. 78
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The Ohio Dogbanes
Humphrey, Lillian E. pp. 79-80
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