TY  - BOOK
AU  - EVENSON Robert E
AU  -  KISLEV Yoav
TI  - Agricultural research and productivity
SN  - 0300018770
U1  - "X9(J):2.1, L5" 
PY  - 1975///
CY  - "London,"
PB  - "Yale University Press,     "
N1  - Bibliography: P 327-41
ER  -