Ducks -- Iowa -- Union Slough National Wildlife Refuge
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Dabbling duck recruitment in relation to habitat and predators at Union Slough National Wildlife Refuge, Iowa (Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, 1991., 1991), by Joseph P. Fleskes, Erwin E. Klaas, and U.S. Fish and Wildlife Service (page images at HathiTrust)
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Filed under: Ducks -- Iowa- The ducks of Iowa. (1921), by Frederick L. Fitzpatrick (page images at HathiTrust; US access only)
- Dabbling duck recruitment in relation to habitat and predators at Union Slough National Wildlife Refuge, Iowa (Washington, D.C. : U.S. Dept. of the Interior, Fish and Wildlife Service, 1991., 1991), by Joseph P. Fleskes, Erwin E. Klaas, and U.S. Fish and Wildlife Service (page images at HathiTrust)