Poplars, principal tree willows and walnuts of the Rocky Mountain region
By: by George B. Sudworth
Series: Technical bulletin / United States Department of Agriculture -- no. 420; Technical bulletin (United States. Department of Agriculture) -- no. 420
Publisher: U.S. Dept. of Agriculture
Published: 1934
Place of publication: Washington
Language: eng
Number of pages: 112
Subjects: Willows; Classification; Walnut; Poplar
Notes: Cover title.

Includes bibliographical references (p. 105-111).