Poplars, Principal Tree Willows and Walnuts of the Rocky Mountain Region
Contribution to Book
U.S. Department of Agriculture. Washington, D.C.
Technical Bulletin 420
Sudworth, George B. 1934. Poplars, principal tree willows and walnuts of the rocky mountain region. U.S. Department of Agriculture. Washington, D.C. Technical Bulletin 420.
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