@book{154361,
	author = {Logsdon, John M.},
	title = {Exploring the unknown},
	publisher = {NASA},
	year = {1995-},
	series = {The NASA history series},
	address = {Washington, D.C.},
	note = {Series numbering on vol. 1. incorrectly stated on t.p. as 4218; correct number on spine and series list of titles.}
}