@book{83040,
	author = {Compiled  H.L.S. Tandon.},
	title = {NPK in Indian agriculture (1971-75); a bibliography of nitrogen, phosphorus, potassium and related factors in crops, soils, fetilisers and manures.},
	publisher = {European Nitrogen Service Programme},
	year = {1978},
	address = {New Delhi}
}