@book{34620,
	author = {Blazy, Pierre. and Roubault, Marcel.},
	title = {El beneficio de los minerales },
	publisher = {Rocas y Minerales, },
	year = {[1977]},
	series = {Colección Rocas y Minerales},
	address = {Madrid : },
	edition = {1ª ed.}
}