@book{153785,
	author = {Xu, Meiling. and Robinson, Arthur Howard, and ebrary, Inc.},
	title = {The fidelity of isopleth maps},
	publisher = {University of Minnesota Press,},
	year = {[1970]},
	address = {Minneapolis :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10231180}
}