@book{219520,
	author = {National Assessment of Educational Progess (Project)},
	title = {U.S. history},
	publisher = {U.S. Dept. of Education, Office of Educational Research and Improvement},
	address = {Washington, DC},
	note = {Description based on first issue; title from PDF t.p. (viewed Nov. 13, 2008)},
	url = {http://purl.access.gpo.gov/GPO/LPS105321}
}