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3
-
A model for a fertilizer information unit in developing countries / Lewis B. Williams.
- International fertilizer development center (IFDC),
- 1990.
- Muscle Shoals, AB :
-
Fertilizer situation and markets in Zambia / Lewis B. Williams and John H. Allgood.
- International fertilizer development center,
- 1991.
- Muscle Shoals, AB :
-
Fertilizer situation and markets in Malawi / Lewis B. Williams and John H. Allgood.
- IFDC,
- 1990.
- Muscle Shoals, AB :