@book{40594,
	author = {Chomnales, R.},
	title = {Estudio microscópico de minerales de cobre-plomo de diferentes niveles en mina Olga, dpto. Yavi.},
	publisher = {IDGYM,},
	year = {dic, 1971.},
	series = {Informe Inédito},
	address = {Jujuy :}
}