Ducks, Geese, and Swans of North America; a Vade Mecum for the Naturalist and the SportsmanFrancis H. Kortright, Wildlife Management Institute · First published 2011Open the Tome
Scientific Descriptions, Identifications, and Life Stories of Ducks, Geese and Swans in North America and EuropeFrancis H. Kortright · First published 2011Open the Tome
The ducks, geese, and swans of Northern AmericaFrancis H Kortright · First published 1957Open the Tome
1943 Ducks Geese Swans Of North America With 36 Color Prints IllustratedCANADA FRANCIS H. KORTRIGHT OF TORONTO · First published 1943Open the Tome
