TY  - BOOK
AU  - Spedding, Colin Raymond Willian.
TI  - The biology of agricultural systems
U1  - 630.215 
PY  - 1975///
CY  - London
PB  - Academic Press
KW  - EcologÃ­a agrÃ­cola
KW  - EcologÃ­a animal
KW  - Ecosistema
ER  -