Moermond JE, Spindler MA. Migration route and wintering area of Tundra Swans Cygnus columbianus nesting in the Kobuk-Selawik Lowlands, North-West Alaska. Wildfowl [Internet]. 1997 Jan. 1 [cited 2025 Dec. 17];:16-25. Available from: https://tidsskrift.dk/Wildfowl/article/view/154103