Plants of Iowa; a preliminary list of the native and introduced plants of the state, not under cultivation Greene, Wesley. creator Iowa State Horticultural Society. contributor text book Des Moines Bishard brothers, printers 1907 1907
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ENG Botany Iowa Bulletin of the State horticultural society https://www.biodiversitylibrary.org/bibliography/29626 4371798 agr08000106 10.5962/bhl.title.29626 U.S. Dept. of Agriculture