Part 1. The growing popularity of today's radio-frequency communications. Chapter 1. Expanding markets for cellular telephones. p.3.-- Chapter 2. Emergind trends in communications satellites. p.37.-- Part 2. Spaceborne mobile communication systems now in use. Chapter 3. Mobile communications on the high seas. p.73.-- Chapter 4. Spaceborne land-mobile communication systems. p.93.-- Chapter 5. Satellite messaging for commercial jets. p.111.-- Part 3. Mobile satellite constellations now emerging from the drawing board. Chapter 6. Selecting the proper constellation architecture. p.129. p.129.-- Chapter 7. Mobile communication satellites at geosync. p.149.-- Chapter 8. Telegram satellites launched into low-altitude orbits. p.165.-- Chapter 9. Low-altitude voice-messaging systems. p.183.-- Chapter 10. Medium-altitude constellations. p.201.-- Part. 4. Summaries and predictions. Chapter 11. Summing up. p.217.-- Chapter 12. Crystal-ball predictions for century 21. p.229.-- Appendix A. Useful magazines and periodicals. p.241.-- Appendix B. Professional societies. p.243
