"Secrets
of Antigravity Propulsion", LaViolette, Paul A. Bear and
Company, Rochester, Vermont, 2008. ISBN 978-1-59143-078-0.
- This is an
overview of several interesting approaches to
Antigravity: Tesla, UFOs, Townsend Brown, Searl Effect,
classified Aerospace Technology, etc. Quite a few useful
appendices.
"Introduction
to Physics, Astrophysics, and Cosmology of Gravity-Like
Fields", Dröscher, W, and Häuser, J, HPCC Space GmbH, Hamburg,
2016. ISBN 978-3-00-050624-6.
- This is a
primer for Dröscher & Häuser's work on extending
Heim's Theory of Gravity, and addresses the possibility
of Gravity existing in more than one form - one of
which, at least, may be open to control similar to
Electromagnetism.
"Unconventional
Flying Objects", Hill, Paul R. Hampton Roads, 1995.
- An overview
of possible field propulsion techniques for flying
vehicles.