July 1980 Shuttle Down, Del Rey, April 1981 Space Doctor, Del Rey, June 1981 The Abode of Life, Pocket Science Fiction, May 1982 Manna, DAW Science Fiction, January 1984 A Matter of Metalaw, DAW Science Fiction, October 1986 Paperback, as G. Harry Stine Warbots, Pinnacle Science Fiction, May 1988, Warbots #2: Operation Steel Band, Pinnacle Science Fiction, July 1988, Warbots #3: The Bastaard Rebellion, Pinnacle Science Fiction, September 1988, Warbots #4: Sierra Madre, Pinnacle Science Fiction, November 1988, Warbots #5: Operation High Dragon, Pinnacle Science Fiction, January 1989, Warbots #6: The Lost Battalion, Pinnacle Science Fiction, April 1989, Warbots #7: Operation Iron Fist, Pinnacle Science Fiction, August 1990, Warbots #8: Force of Arms, Pinnacle Science Fiction, March 1990, Warbots #9: Blood Siege, Pinnacle Science Fiction, September 1990, Warbots #10: Guts and Glory, Pinnacle Science Fiction, June 1991, Warbots #11: Warrior Shield, Pinnacle Science Fiction, February 1992, Warbots #12: Judgement Day, Pinnacle Science Fiction, September 1992, Starsea Invaders: First Action, New American Library, August 1993 Starsea Invaders: Second Contact, New American Library, March 1994 Starsea Invaders: Third Encounter, New American Library, May 1995 Open Space (graphic novel, undated) Non-fiction Earth Satellites and the Race for Space Superiority, 1957 Rocket Power and Space Flight, Henry Holt & Co., 1957 Man and the Space Frontier, 1962 The Third Industrial Revolution, Putnam, 1975, Shuttle into Space: A Ride in America's Space Transportation, 1978 The Third Industrial Revolution, Ace Science Fiction, May 1979, The Space Enterprise, Ace Science, August 1980, Confrontation in Space, Prentice-Hall, 1981 Space Power, Ace Science, September 1981, The Space Enterprise, 1982 The Hopeful Future, MacMillan, 1983, The Silicon Gods, Dell, October, , 1984 The Untold Story of The Computer Revolution, Arbor House, 1984, Frontiers of Science: Strange Machines You Can Build, Atheneum, 1985, Handbook for Space Colonists, Henry Holt & Co., 1985, On the Frontiers of Science, Atheneum, 1985, The Corporate Survivors, Amacom Books, 1986, ICBM: The Making of the Weapon That Changed the World, Crown, 1991, Mind Machines You Can Build, Top Of The Mountain Publishing, 1992, Halfway to Anywhere, M. Evans and Company, N.Y., 1996, Living in Space, M. Evans & Co., 1997, The Manna Project: Business Opportunities in Outer Space, 1998 Model rocketry The Handbook of Model Rocketry 1st ed., Follet Publishing, 1965 The Handbook of Model Rocketry 2nd ed., Follet Publishing, 1967 The Handbook of Model Rocketry 3rd ed., Follet Publishing, 1970 The Handbook of Model Rocketry