@article {329,
	title = {Results of the Puritan-American Museum of Natural History expedition to Western Mexico. 9. Herpetology of the Tres Marias Islands. Bulletin of the American Museum of Natural History},
	volume = {119},
	number = {2},
	year = {1960},
	pages = {1-60},
	author = {Zweifel, R G}
}
@article {309,
	title = {Relict species of the Chihuahuan DesertThe Southwestern Naturalist},
	year = {1960},
	pages = {75-88},
	publisher = {JSTOR},
	author = {Milstead, W.W.}
}
