@book{257564,
	title = {Types of Maps},
	publisher = {U.S Dept. of the Interior, U.S. Geological Survey},
	year = {1991},
	address = {Reston, VA},
	note = {Cover Tittle},
	url = {http://catalog.gpo.gov/fdlpdir/locate.jsp?ItemNumber=621&SYS=000362755}
}