TY  - BOOK
AU  - Grado,Adolfo de
TI  - The Raven: : a natural history in Britain and Ireland 
SN  - 0856610909
PY  - 1997///.
CY  - London 
PB  - : T & A D Poyser
KW  - Aves
KW  - Cuervos
N1  - Bibliografia. Indice
ER  -