TY  - BOOK
ED  - National Research Council. Washington. Subcommittee on Swine Nutrition
TI  - Alternative agriculture
U1  - 630.973 
PY  - 1989///
CY  - Washington, D.C.
PB  - National Academy Press
KW  - Agricultura
KW  - Aspectos economicos
KW  - E.U.A
KW  - Ecología agrícola
KW  - Sistemas de cultivo
ER  -