@book{118772,
	author = {Ryden, Kent C., and Franklin, Wayne. and ebrary, Inc.},
	title = {Mapping the invisible landscape},
	publisher = {University of Iowa Press,},
	year = {c1993.},
	series = {The American land and life series},
	address = {Iowa City :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10481056}
}