Background
This is a projected eight volume series of selected documents in the history of the U.S. civil space program, published by NASA.
Document Archive
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume I, Organizing for Exploration. NASA SP-4407, 1995 [796 pages, 52.6MB]
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume II, External Relationships. NASA SP-4407, 1996 [636 pages]
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Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume III, Using Space. NASA SP-4407,1998 [626 pages]
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume IV, Accessing Space. NASA SP-4407, 1999 [713 pages]
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume V, Exploring the Cosmos. NASA SP-4407, 2001 [823 Pages, 4.4MB]
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume VI: Space and Earth Science. NASA SP-2004-4407, 2004 [780 pages]
Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume VII: Human Spaceflight: Project Mercury, Gemini, and Apollo. NASA SP-2008-4407, 2008 [886 Pages, 8.53MB]
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