@book{191952,
	author = {Perry, John, and Perry, Jane Greverus. and Sierra Club.},
	title = {The Sierra Club guide to the natural areas of Idaho, Montana, and Wyoming /},
	publisher = {Sierra Club Books,},
	year = {1988.},
	address = {San Francisco :},
	url = {http://www.loc.gov/catdir/description/random047/87026312.html}
}