Dr. Crypton
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Dr. Crypton and His Problems: Mind Benders from Science Digest
Visitors from the Red Planet and 76 Other Solve-Them-Yourself Mysteries
Dr. Crypton's Mind Benders: From Science Digest
Visitors from the Red Planet and 76 Other Solve-Them-Yourself Mysteries
The Museum of Science and Industry, Chicago, presents the Mind game
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