NPK in Indian agriculture (1971-1975) a bibliography of nitrogen, phosphorus, potassium and related factors in crops, soil, fertilisers and manures - Tandon, H L S (Comp.); European Nitrogen Service Programme (New Delhi) (New Delhi European Nitrogen Service Programme, 1972)
Keywords: Agriculture-India-Bibliography; Nitrogen-India-Bibliography; Phosphorus-Bibliography; Soil fertility-Bibliography