TY  - BOOK
AU  - Williams,Moyle Strayhorn
AU  - Couston,John W.
TI  - Crop production levels and fertilizer use / 
PY  - 1962///
CY  - Rome : 
PB  - Food and Agriculture Organization of the United Nations, 
KW  - Fertilizers
KW  - Crop yields
N1  -  Includes bibliography
ER  -