@book{20639,
	author = {Maphis, Charles G.},
	title = {Educational extension,},
	publisher = {Govt. Print. Off.,},
	year = {1923.},
	series = {[U.S.] Bureau of Education. Bulletin, 1923,},
	address = {Washington,},
	note = {At head of title: Department of the Interior ...}
}