But here's yet another article that came out this week about the same thing. No big surprise: Robert Heinlein is discussed; he was also mentioned in that other article that I can't find. (If you are looking for a big surprise, Google both Heinlein's name and Philip K. Dick's at the same time. Wikipedia might be a good place to go. The friendship the two had is as unlikely as it is touching.)
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Fellow Tulsans: you really need to check out Oak Tree, a used bookstore on 15th Street near Delaware. It is easily my favorite used book store and for good reason: every single one of their books is in decent to great condition, the prices aren't outrageous, and the guys that work there know their shit inside and out.