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Description: |
iv, 20 pages : illustrations ; 23 cm. |
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General Note: |
At head of title: United States Department of the Interior, Harold L. Ickes, Secretary. Fish and Wildlife Service, Ira N. Gabrielson, Director. |
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"This bulletin supersedes Farmers' bulletin 1783, issued in 1937 by the U.S. Department of agriculture-a contribution of the Bureau of biological survey."--Page 1. |