Books by Robert E. Stewart:
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Stewart, Robert E.: Breeding Birds of North Dakota (illustrated HTML at Wayback Machine)- Stewart, Robert E.: Classification of Natural Ponds and Lakes in the Glaciated Prairie Region (resource publication #92; Washington: Bureau of Sport Fisheries and Wildlife, 1961), also by Harold A. Kantrud (PDF with commentary at usgs.gov)
Additional books by Robert E. Stewart in the extended shelves:
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Stewart, Robert E.: Birds of Maryland and the District of Columbia (U.S. Dept. of the Interior, Fish and Wildlife Service, 1958), also by Chandler S. Robbins (page images at HathiTrust)- Stewart, Robert E.: Classification of natural ponds and lakes in the glaciated prairie region (Washington, D. C. U.S. Bureau of Sport Fisheries and Wildlife; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1971., 1971), also by Harold A. Kantrud and United States. Bureau of Sport Fisheries and Wildlife (page images at HathiTrust)
- Stewart, Robert E.: Distribution of the black duck (U.S. Govt. Print. Off., 1958) (page images at HathiTrust)
- Stewart, Robert E.: Vegetation of prairie potholes, North Dakota, in relation to quality of water and other environmental factors (U.S. Govt. Print. Off, 1972), also by Harold A. Kantrud and United States. Bureau of Sport Fisheries and Wildlife (page images at HathiTrust)
- Stewart, Robert E.: Veterans Administration prosthetic and sensory aids program since World War II (Veterans Administration, Dept. of Medicine and Surgery, Prosthetic and Sensory Aids Service : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978), also by William M. Bernstock and United States. Veterans Administration. Prosthetic and Sensory Aids Service (page images at HathiTrust)
Find more by Robert E. Stewart at your library, or elsewhere.