@book{7497,
	author = {Passarge, Siegfrid and Gómez De Llarena, Joaquín},
	title = {Geomorfología.},
	publisher = {Labor,},
	year = {1931.},
	series = {Colección Labor. Sección VII, Geografía ;},
	address = {Barcelona :},
	note = {p.183.}
}