BEER, John. Wildfowl mortality in the Slimbridge collection during the winters of 1961-62 and 1962-63. Wildfowl, [S. l.], v. 15, p. 7, 1964. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155184. Acesso em: 5 apr. 2026.