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The bird business : a study of the commercial cage bird trade / by Greta Nilsson ; with a foreword by S. Dillon Ripley and a chapter by Tim Inskipp - 2a ed. - Washington : Animal Welfare Institute, 1981 - ix, 121 p. : fot. (algunas col.) ; 28 cm.
Incluye bibliografía, apéndice e índice.