Kortright, Francis H. The ducks, geese and swans of North America, : a vade mecum for the naturalist and the sportsman, [electronic resource] / by Francis H. Kortright. Illustrations by T.M. Shortt.. — Washington, D.C., : American Wildlife Institute,, 1943.. — 3 p. l., v-viii, 476 p. incl. illus. (incl. maps) : 36 col. pl., fold. tab. 23 cm.