TY  - BOOK
AU  - Ruthenberg
AU  - Ruthenberg
TI  - Farming Systems In The Trophic   Xxll,424p, 11.3tbls, 11.6figs,33plts
U1  - Ju18 
PY  - 1980///
CY  - Oxford
PB  - Clarendon Press
KW  - Ju18
ER  -