@book{47988,
	author = {Short, Nicholas M.},
	title = {Mission to earth},
	publisher = {Scientific and Technical Office, National Aeronautics and Space Administration : for sale by the Supt. of Docs., U.S. Govt. Print. Off.},
	year = {1976.},
	series = {NASA SP},
	address = {Washington},
	note = {Includes index.}
}