@article {,
	title = {Prehispanic obsidian mines in southern Hidalgo},
	journal = {American Antiquity},
	volume = {32},
	number = {4},
	year = {1967},
	note = {Source of data: Anthropological Literature, Harvard University},
	pages = {542-543},
	publisher = {Salt Lake City, 1967},
	keywords = {Mexico--Archaeology--Hidalgo, Mexico--Archaeology--Obsidian},
	author = {Spence, Michael W.}
}