TY  - BOOK
AU  - Symposium on Physiological Aspects of Crop yield, Lincoln, Jan.20-24, 1969.
TI  - Physiological aspects of crop yields; proceedings
U1  - 633:581.1(082.2) L7 
PY  - 1969///
CY  - Madison
PB  - American Society of Agronomy; Crop Science Society of America
KW  - Crops Yield-physiological aspects-congresses
ER  -