The Ancient Engineers
| Title | The Ancient Engineers PDF eBook |
| Author | L. Sprague De Camp |
| Publisher | Barnes & Noble Publishing |
| Pages | 436 |
| Release | 1990 |
| Genre | Engineering |
| ISBN | 9780880294560 |
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Describes methods used by early irrigators, architects, and military engineers to build and maintain structures to serve their ruler's wants.
UFO's--a Scientific Debate
| Title | UFO's--a Scientific Debate PDF eBook |
| Author | Carl Sagan (1934- ed) |
| Publisher | |
| Pages | 0 |
| Release | 1972 |
| Genre | |
| ISBN | 9780801407406 |
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