27. "A Solar Power Satellite Transmission System Incorporating Automatic Beam Forming, Steering and Phase Control," LinCom, Inc., TR-7806-0977, Contract NAS9-15237, June 1978. 28. "Achievable Flatness in a Large Microwave Power Antenna," General Dynamics, Convair Div., Contract NAS9-15423, September 1978. 29. Perkins, F. W. and R. G. Robie, "Ionospheric Heating By Radiowaves: Predictions for Arecibo and the Satellite Power Station," J. Geophysical Research (to be published). 30. Holway, L. H., A. H. Katz, G. Melty, "Ionospheric Effects of a High Power Space-Borne Microwave Beam," Raytheon Technical Memorandum T-1028, Waltham, M.A., Nov. 1977. 31. Arndt, G. D. and L. Leopold, "Environmental Considerations for the Microwave Beam from a Solar Power Satellite," 13th Intersociety Energy Conversion Engineering Conference, San Diego, CA, August 1978. Transportation 32. "Future Space Transportation Systems Analysis Study," Boeing Aerospace Corporation, D180-20242, Contract NAS9-14323, December 1976 (Vol. 1: N77-31235; Vol 2: X77-78969 (N); Vol 3: X77-79819 (G)). 33. "Orbital Propellant Handling and Storage Systems for Large Space Programs," General Dynamics Convair Div., CASD-ASP-78-001, Contract NAS9-15305, April 1978. Orbital Construction 34. "Orbital Assembly and Maintenance Study," Martin Marietta Corporation, MCR-75-319, Contract NAS9-14319, August 1975 (N75-32144). 35. "Orbital Construction Demonstration Study," Grumman Aerospace Corp., NSS-0C-RP-008, Contract NAS9-14916, December 1976 (N77-23136). 36. "Orbital Construction Support Equipment," Martin Marietta Corporation, MCR-77-234, Contract NAS9-15120, June 1977 (N77-27157).
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