@book{40787,
	author = {Jenna, R.},
	title = {Informe sobre la explotación geofísica de la Mina La Esperanza, Salta.},
	publisher = {IDGYM,},
	year = {oct, 1959.},
	series = {Informe Inédito},
	address = {Jujuy :}
}