Flora of Nebraska; a list of the conifers and flowering plants of the state with keys for their determination Petersen, Niels Frederick, 1877- creator text book Plainview, Neb [c1912] 1912 2d ed.
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ENG Botany Nebraska https://www.biodiversitylibrary.org/bibliography/57020 5656833 10.5962/bhl.title.57020