@book{234,
	author = {Johanson, Donald C. and National Geographic Society (U.S.)},
	title = {Fossils, clues to the past},
	publisher = {National Geographic Society, Educational Services,},
	year = {c1983.},
	address = {Washington, D.C. :},
	note = {Intended audience: Grades 7-12 and adults.}
}