TY  - BOOK
ED  - E.U.A. National Academy of Sciences
TI  - Productivity of world ecosystems: proceedings of a symposium (1972)
SN  - 0-309-02317-3
U1  - 333.713 
PY  - 1975///
CY  - WashingtonEUA
PB  - U.S. National Committe For The International Biological Program
KW  - Ecosistemas
KW  - Recursos naturales
KW  - explotación
N1  - FACULTAD DE ZOOTECNIA
ER  -