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Dr. Crypton

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Stand Alone

Timid Virgins Make Dull Company and Other Puzzles, Pitfalls, and Paradoxes
Visitors from the Red Planet and 76 Other Solve-Them-Yourself Mysteries
Dr. Crypton's Mind Benders From Science Digest
Dr. Crypton and His Problems Mind Benders from Science Digest
The Museum of Science and Industry, Chicago, Presents the Mind Game