@book{65129,
	author = {Conferencia de las Naciones Unidas sobre la Desertificación. and FAO},
	title = {Status of desertification in the hot arid regions ; Climate arid index map ; Experimental world scheme of aridity and drought probability ; Desertification map of the world},
	publisher = {FAO,},
	year = {1977},
	address = {Roma :}
}