TY  - BOOK
AU  - Peterson,Roger Tory
TI  - A field guide to western birds: north America west of the 100th meridian, with a section on the birds of the Hawaii andislands 
T2  - The Peterson field guide series
SN  - 0-395-13692-X
AV  - QL683 .W3 P48 1961
PY  - 1961///
N1  - Incluye bibliografia
ER  -