Nos. 6, 9, not published No. 1-56 issued by the U.S. Bureau of Biological Survey (called Division of Ornithology and Mammalogy, no. 1-12, 1889-96; Division of Biology Survey, no. 13-24, 1897-19 ; Biological Survey, no. 25, 1905); no. 57-64, 1941-62, U.S. Fish and Wildlife Service; no. 65-69; 1968-74, U.S. Bureau of Sport Fisheries and Wildlife; no. 70- 1975- U.S. Fish and Wildlife Service
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