REFERENCES 1. G. K. O'Neill, Nature (London) 250, 636 (1974) 2. G. K. O'Neill, "The Colonization of Space", Physics Today 27, 32 (September 1974) 3. W. C. Brown, Proc. IEEE 62, 11 (January 1974) 4. News release, Office of Public Information, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, 1 May 1975 5. G. R. Woodcock and D. L. Gregory, AIAA paper 75-640, presented at the AIAA/AAS Conference on Solar Energy for Earth, 24 April 1975 6. K. Bammert and G. Deuster, paper at the ASME Gas Turbine Conference, Zurich, April 1974 7. P. E. Glaser, in Space Shuttle Payloads, Hearing before the Committee on Aeronautical and Space Sciences, U. S. Senate, 93rd Congress, 1st Session, on Candidate Missions for the Space Shuttle, 31 October 1973 (Government Printing Office, Washington, D. C., 1973, part 2, pp. 11-62) 8. R. E. Austin and R. Brantley, presentation at NASA Headquarters, Washington, D. C., 17 April 1975 (unpublished) 9. R. E. Austin, personal communication 10. "Launch Vehicle Estimating Factors for Advanced Mission Planning," NASA Handb. NHB-7100.5B (1973) 11. R. Wilson, in Proceedings of the Conference on Space Colonization, Princeton University, 10 May 1974, G. K. O'Neill and R. W. Miles, Eds., in press 12. H. P. Davis, in Proceedings of the 1975 Princeton University Conference on Space Manufacturing Facilities, G. K. O'Neill, R. W. Miles, R. H. Miles, Eds., in press. Typical values are: nonrecurring, $10 billion; recurring, $220/kgsy. 13, NASA-Ames/ASEE (American Society for Engineering Education)/ Stanford University Summer Study Report, System Design for Space Colonization (NASA-Ames Research Laboratory, Mountain View, California, in press) 14. G. K. O'Neill, Science 190, No. 4218, pp. 943-947, December 5, 1975 15. Exxon Corporation, advertisement in Smithsonian Magazine 6_, 117 (April 1975) 16. D. Hayes, Science 188, No. 4195, 27 June 1975
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