Audubon, . (1981). Audubon Vol. 83. NEW YORK: NATIONAL AUDUBON SOC.
Audubon, . 1981. Audubon Vol. 83. NEW YORK: NATIONAL AUDUBON SOC.
Audubon, . Audubon Vol. 83. NEW YORK: NATIONAL AUDUBON SOC. 1981.
