@book{118489,
	author = {Borchert, John R., and ebrary, Inc.},
	title = {America's northern heartland},
	publisher = {University of Minnesota Press,},
	year = {c1987.},
	address = {Minneapolis :},
	note = {La couv. porte en plus : An economic and historical geography of the Upper Midwest.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10199634}
}