TY  - GEN
AU  - 
TI  - Agricultural efficiency
SN  - 0854030956
PY  - 1977///
CY  - London
PB  - Royal Society
KW  - Agricultural Efficiency
KW  - Inputs
N1  - Also published as philisophical transactions of the Royal Society of London, Series B. V. 281 (980) 73-301
ER  -