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Former NASA Flight Dynamics Officer providing memoirs on mission control, manned space missions, essays, interviews, and space directory.

An astronomy student's vision of space exploration, and a comprehensive collection of related material.

Provides article collection and research on the Russian and US space programs, Mir and the International Space Station, by an author of numerous books in the space domain.

Provides comprehensive directory with separate sections on amsats, satellite observing, collecting, and space tourism. Frequently updated.

Offers directory and space related articles and sites by a space enthusiast.

Offers a Ph.D. researcher's collection of material related to GPS systems.

Features a space enthusiast's downloadable directory of launched objects.

Provides publications and contacts of a researcher.

Provides a resource for space history, radio tracking and technology by a space enthusiast. Frequently updated.