@book{35721,
	author = {United States. and Springer, Ethel M.},
	title = {Child labor in North Dakota.},
	publisher = {Govt. Print Off.,},
	year = {1923.},
	series = {Bureau publication},
	address = {Washington,},
	note = {At head of title: U.S. Department of Labor. James J. Davis, secretary. Children's Bureau. Grace Abbott, chief.},
	url = {http://nrs.harvard.edu/urn-3:GSE.LIBR:493872}
}