ACKNOWLEDGMENTS The editors wish to thank the National Academy of Sciences, and G. D. Arndt and L. Leopold of the Johnson Space Center for permission to reproduce material in Appendices D and E. Thanks are also extended to the International Radio Consultative Committee for permission to reproduce reports in Appendices A and B. We would also like to thank R. A. Stokes who organized the workshop, and those who assisted in the preparation of this report, G. Long, L. Foley, T. Jewell and V. Tarr. •U.S. GOVERNMENT PRINTING OFFICE : 1980 0-620-309/34
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