Key to the Rocky Mountain flora; Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and parts of Nebraska, South Dakota, North Dakota, and British Columbia Rydberg, Per Axel, 1860-1931 creator text book New York 1919 1919
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ENG Barnhart. Marquand, Eleanor library. Plants Rocky Mountains https://www.biodiversitylibrary.org/bibliography/7742 2360073 19013566 10.5962/bhl.title.7742 DLC