TY  - BOOK
ED  - National Geographic Society (U.S.)
TI  - Field guide to the birds of North America
SN  - 0792274512 (pbk.)
PY  - 1999///
CY  - Washington, DC 
PB  - : National Geographic Society
KW  - Aves
KW  - América del Norte
KW  - Guías
ER  -