The wonder of birds - Graham, Frank; Halle, Louis Joseph 1910-1998; Johnsgard, Paul Austin 1931-2021; LaBastille Bowes, Anne 1933-2011; Laycock, George Edwin 1921-2014 (Washington, D.C. : National Geographic Society, 1983)
Keywords: AVES -- HABITOS Y CONDUCTA; PROTECCION DE LAS AVES