@book{165774,
	author = {Ortíz Villanueva, Bonifacio and Ortíz Solorio, Carlos Alberto, coaut. and UACh. Departamento de Suelos},
	title = {Edafología  /},
	publisher = {UACh :,},
	year = {1980},
	address = {México  :},
	edition = {3a ed.}
}