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McDonald, M. E. (1969). Catalogue of helminths of waterfowl (Anatidae). United States Department of the Interior. Fish and Wildlife Service. Bureau of Sport Fisheries and Wildlife Special Scientific Report—Wildlife No. 126 Washington, D. C. 692 pp.
McDonald, M. E. (1969). Catalogue of helminths of waterfowl (Anatidae). United States Department of the Interior. Fish and Wildlife Service. Bureau of Sport Fisheries and Wildlife Special Scientific Report—Wildlife No. 126 Washington, D. C. 692 pp.
