The Anti-Gravity Files: A Compilation of Patents and Reports by David Hatcher Childress (Editor) - Alibris
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The Anti-Gravity Files eBook by David Hatcher Childress - EPUB Book
The Anti-Gravity Handbook by David Hatcher Childress
The Anti-Gravity Files: A Compilation of Patents and Reports: Childress, David Hatcher: 9781939149756: Books
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Anti-Gravity and the Unified Field (Lost Science Series)
The Anti-Gravity Files: A Compilation of Patents and Reports (Lost Science): Childress, David Hatcher: 9781939149756: : Books