TY  - GEN
AU  - Brown , A.W.A .
AU  - Byerly ,T.C 
AU  - Gibbs ,  M.
AU  - Pietro , San  A 
TI  - Crop productivity -research imperatives
U1  - 631.52 
PY  - 1975///
CY  - Michigan
PB  - Michigan state univrsity 
KW  - CULTIVATION AND HARVESTING
ER  -