Geese and Swans in the world monograph
Emu
39(1) 17 - 17
Published: 1939
https://doi.org/10.1071/MU939017
© Royal Australian Ornithologists Union 1939
Emu
39(1) 17 - 17
Published: 1939
https://doi.org/10.1071/MU939017
© Royal Australian Ornithologists Union 1939