American interest in "gravity control propulsion research" intensified during the early 1950s. Literature from that period used the terms anti-gravity, anti-gravitation, baricentric, counterbary, electrogravitics (eGrav), G-projects, gravitics, gravity control, and gravity propulsion.[1][2] Their publicized goals were to discover and develop technologies and theories for the manipulation of gravity or gravity-like fields for propulsion.[3] Although general relativity theory appeared to prohibit anti-gravity propulsion, several programs were funded to develop it through gravitation research from 1955 to 1974. The names of many contributors to general relativity and those of the golden age of general relativity have appeared among documents about the institutions that had served as the theoretical research components of those programs.[4][5][6] Since its emergence in the 1950s, the existence of the related gravity control propulsion research has not been a subject of controversy for aerospace writers, critics, and conspiracy theory advocates alike, but their rationale, effectiveness, and longevity have been the objects of contested views.
^Gravity Rand Ltd (1956, December). The gravitics situation. In T. Valone (Ed.). (2001, January, 4th ed.) Electrogravitics systems: Reports on a new propulsion methodology (pp. 42-77). Washington, D.C: Integrity Research Institute. ISBN0-9641070-0-7
^Weyl, A. R. (1957, October). 'Antigravity'. Aeronautics, 37(2), 80-86. (British Aviation Publications). Weyl, A. R. (1959a, January). "Knowledge and possibilities of gravity research" (DTIC No. AD-0830247). W. R. Eichler (Trans.) Weltraumfahrt; Zeitschrift für Rakententechnik, 9, 100-106 (original work published December 1958). Weyl, A. R. (1959b, February). Gravity and the prospects for astronautics. Aeronautics, 59(6), 16-22. (British Aviation Publications).
^Gravity Research Group (1956, February). Electrogravitic systems: An examination of electrostatic motion, dynamic counterbary and barycentric control (Report GRG 013/56). London: Aviation Studies (International) Ltd. In T. Valone (Ed.). (2001, January, 4th ed.) Electrogravitics systems: Reports on a new propulsion methodology (pp. 11-41). Washington, D.C.: Integrity Research Institute. ISBN0-9641070-0-7
^Kaiser, D. (2000). Chapter 10 – Roger Babson and the rediscovery of general relativity. In Making theory: Producing physics and physicists in postwar America (Ph.D. dissertation: pp. 567-594). Harvard University.
^Goldberg, J. M. (1992). United States Air Force support of general relativity: 1956-1972. In, J. Eisenstaedt & A. J. Kox (Ed.), Studies in the History of General Relativity, Volume 3 Boston: Center for Einstein Studies. ISBN0-8176-3479-7.
^Bender, W. W. (1961). RIAS. Baltimore, Maryland: RIAS. Available from Stan Piet, Archive Director, Glenn L. Martin Maryland Aviation Museum, P.O. Box 5024, Middle Road, MD 21220.