@book{40757,
	author = {Giordana, C. A.},
	title = {Ensayo de concentración gravitacional de tipo expeditivo para recuperación de plomo y plata.},
	publisher = {IDGYM,},
	year = {nov, 1974.},
	series = {Informe Inédito},
	address = {Jujuy :}
}