File:Rob Hubbard - 05.jpg - Video Game Music Preservation Foundation Wiki
File:L. Ron Hubbard influences.svg - Wikimedia Commons
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retro* Gamer Spezial 2/2017 – C64-Wiki
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File:L Ron and Sara Hubbard June 1946.jpg - Wikimedia Commons
L. Ron Hubbard - Wikipedia
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L. Ron Hubbard - Wikipedia
Thrust – C64-Wiki
