According to this ad on Amazon, it appears that Bob Jones book - XS11 Heaven - has become quite valuable. The price shown is for a used one.
http://www.amazon.com/s/?ie=UTF8&key...l_3nicpedajj_b
http://www.amazon.com/s/?ie=UTF8&key...l_3nicpedajj_b

If that is what determines its worth, I am sitting on a gold mine with the two I own. You're billionaire waiting for your ship to role in Mike.

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