''Watch the Skies! A Chronicle of the Flying Saucer Myth'', 1994. Smithsonian Institution . ISBN 1-56098-343-4
'' Asteroid s: a History'', 2001, Smithsonian Institution Press, ISBN 1-56098-982-3 (or 2000, ISBN 1-56098-389-2).
''Twilight Warriors: Covert Air Operatrions Against the USSR'', 2005, Naval Institute Press , ISBN 1591146607
''The Moby Dick Project: Reconnaissance Balloons over Russia'', 1991, Smithsonian Books , ISBN 1-56098-025-7
''Dark Eagles: A History of Top Secret U.S. Aircraft Programs'', 1997. ISBN 0891416234
''Shadow Flights'' ISBN 0891417001
''Guardians: Strategic Reconnaissance Satellites'' ISBN 0891412840
''Battle for Space'' ISBN 0825301602
''High Frontier: The U.S. Air Force and the Military Space Program'', 1997. ISBN 0160489458
''The Corona Project: America's First Spy Satellites'', Annapolis: Naval Institute Press. ISBN 1557506884.
''Flying Without Wings: NASA Lifting Bodies and the Birth of the Space Shuttle'' (Smithsonian History of Aviation and Spaceflight) (with Milton O. Thompson), 1999 ISBN 0947554785
