TY  - BOOK
AU  - Norman, A G
TI  - Advances in agronomy 
PY  - 1962///
CY  - New York: 
PB  - Academic Press, 
KW  - Agriculture
KW  - Rainfall erosion
KW  - Fertilizers
N1  - Vol. 13 (American society of agronomy): xi; 386p.
Vol. 14 (American society of agronomy): xi; 432p.
Vol. 15 (American society of agronomy): xi; 415p
ER  -