@article {33922,
	title = {Relation of geographic variation in the skull of Microtus pennsylvanius to climate},
	volume = {61},
	year = {1983},
	pages = {1232-1241},
	publisher = {Canadian Journal of Zoology},
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc?_handler_=HandleInitialGet\&calyLang=eng\&journal=cjz\&volume=62\&articleFile=z84-304.pdf},
	author = {Snell, R. R. and Cunnison, K. M.}
}
