TY  - BOOK
AU  - Peterson,Roger Tory
TI  - A field guide to Mexican birds;field marks of all  species found in Mexico, Guatemala, Belize (British  Honduras), El Salvador,
T2  - Peterson field guide series ;20  
SN  - 0395171296
U1  - KUŞ 598.2972 
PY  - 1973///
CY  - Boston
PB  - Houghton Mifflin
KW  - Birds -- Mexico -- Identification
KW  - Birds -- Central America -- Identification
N1  - "Sponsored by the National Audubon Society and National  Wildlife Federation."; Bibliography: p. 261-262
ER  -