@book{15075,
	author = {Education Commission of the States. and National Center for Education Statistics.},
	title = {National assessment of educational progress},
	publisher = {[U.S. Dept. of Health, Education, and Welfare, Education Division] National Center for Education Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off.},
	year = {1970-},
	address = {Washington},
	note = {Contract agency: National Center for Education Statistics.}
}