TY  - BOOK
AU  - Peterson,Roger Tory
AU  - Peterson,Virginia Marie
ED  - National Audubon Society.
ED  - National Wildlife Federation.
ED  - Roger Tory Peterson Institute.
TI  - A field guide to western birds: a completely new guide to field marks of all species found in North America west of the 100th meridian and north of Mexico 
T2  - The Peterson field guide series
SN  - 039551424X (pbk.)
AV  - QL683.W4 P47 1990
U1  - 598.2978 20
PY  - 1990///
CY  - Boston
PB  - Houghton Mifflin
KW  - Birds
KW  - West (U.S.)
KW  - Identification
KW  - Canada, Western
KW  - Aves
KW  - Oeste
KW  - E.U.A
KW  - Identificación
KW  - Canada
N1  - Incluye referencias bibliográficas (p. 416) e índice
ER  -