TY  - BOOK
ED  - Food and Agriculture Organization of the United Nations.
TI  - Crop production levels and fertilizer use
SN  - 9251010994
U1  - 631.81 
PY  - 1981///
CY  - Rome
PB  - Food and Agriculture Organization of the United Nations
KW  - Fertilizers
KW  - Crop yields
KW  - Economic aspects
KW  - Developing countries
N1  - "Fertilizer and Plant Nutrition Service. Land and Water Development Division."
ER  -