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