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Annotated Checklist of the Seed Plants, Ferns and Fern Allies (division Tracheophyta) for Clearwater County and Itasca State Park, Minnesota

Gerald B. Ownbey

出版	University of Minnesota, 1969
URL	http://books.google.com.hk/books?id=vbxMAQAAMAAJ&hl=&source=gbs_api