TY  - BOOK
AU  - American Society of Agronomy.
TI  - Maximum Crop Yields-the Challange:Two Symposia Held at Oklahoma State Univ. Stai
T2  - ASA sp. Pubn,No.9
U1  - 633 A6M2 
PY  - 1967///
CY  - Madison(Wisc.)
PB  - ASA
ER  -