@book{31970,
	author = {Hempstead, Colin.},
	title = {Encyclopedia of 20th-century technology /},
	publisher = {Routledge,},
	year = {2005.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0647/2004004862-d.html}
}