A field guide to Western birds /
Peterson, Roger Tory, 1908-
A field guide to Western birds / by Roger Tory Peterson - Boston : Mifflin, 1969 - xxvi, 366 p. : ill. (some col.) ; 20 cm.
Includes index
60-012250
Birds--West (U.S.)
A field guide to Western birds / by Roger Tory Peterson - Boston : Mifflin, 1969 - xxvi, 366 p. : ill. (some col.) ; 20 cm.
Includes index
60-012250
Birds--West (U.S.)
