Appraisal of fertilizer markets & distribution systems in Central America ; with emphasis on small farmersJohn T. Shields · First published 1975Open the Tome
Review & analysis of the fertilizer situation in Latin AmericaJohn T. Shields · First published 1974Open the Tome
The fertilizer industry in the PhilippinesJohn T. Shields, Robert C. Gray, United States. Agency for International Development, United States. Presidential Fertilizer Commission, National Fertilizer Development Center (U.S.) · First published 1971Open the Tome
