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North American Migrant Raptors. Boston: Houghton Mifflin Harcourt. ISBN 0-3955-1022-8. Ferguson-Lees, et al. del Hoyo, J; Elliot, A; Sargatal, J (1996). Handbook...39 KB (3,886 words) - 23:24, 3 April 2024
North American Migrant Raptors. Boston: Houghton Mifflin Harcourt. ISBN 0-3955-1022-8. Burles, D. W. & Frey, R. (1981). Raptor monitoring program, 1980 report...102 KB (12,588 words) - 08:36, 20 March 2024
