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Energy, fertilizer and grain production in the U. S. S. R. Key linkages
Auburn, Jill Shore, (1983)
Environmental dimensions of rural regional development, a report of a study in three Asian countries
Oya, Kenji, (1982)
Soil and crop productivity : a handbook for the use of workers in agricultural extension, vocational agriculture and farmers in India
Govinda, S. V. Rajan, (1971)