@mastersthesis {27260,
	title = {An examination of the cementum of the teeth of Bovidae with special reference to its use in age determination},
	volume = {Zoology},
	year = {1965},
	pages = {72},
	address = {University of Alberta},
	keywords = {bighorn sheep, bison, mountain goats},
	author = {Armstrong, George Galen}
}
