@book{149,
	author = {Centre d'Etude de I'Azote and Geus, De J.G.},
	title = {1970 Fertilizer Guide: for Food Grains in the Tropics and Subtropics},
	publisher = {Centre d'Etude de I'Azote},
	year = {1970},
	address = {Zurich}
}