@article {31556,
	title = {Patterns of change in the Late-Quaternary vegetation of the Western Interior of Canada},
	volume = {56},
	year = {1978},
	pages = {2177-2183},
	publisher = {Canadian Journal of Botany},
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/rpv?hm=HInit\&journal=cjb\&volume=56\&afpf=b78-260.pdf},
	author = {Ritchie, J.C. and Yarranton, G. A.}
}
