@book{21030,
	author = {Heck, Arch Oliver,},
	title = {Special schools and classes in cities of 10,000 population and more in the United States /},
	publisher = {U.S. G.P.O. :},
	year = {1930.},
	series = {Bulletin / United States Department of the Interior, Office of Education ;},
	address = {Washington :}
}