@article {,
	title = {Mapa geol{\'o}gico del cuadrangulo de Callalli, Hoja 32-t},
	year = {1985},
	publisher = {Instituto Geol{\'o}gico Minero y Metal{\'u}rgico},
	address = {scale 1:100,000},
	author = {Ellison, R. and J. De La Cruz}
}