@book{191119,
	author = {Spiker, Elliott C. and Gori, Paula.},
	title = {National landslide hazards mitigation strategy},
	publisher = {U.S. Geological Survey},
	year = {2003.},
	series = {Circular},
	address = {Reston, Va.},
	url = {http://purl.access.gpo.gov/GPO/LPS38869}
}