@book{233309,
	author = {Rival, Laura M. and ebrary, Inc.},
	title = {Trekking through history},
	publisher = {Columbia University Press,},
	year = {c2002.},
	series = {The historical ecology series},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10183370}
}