3773345
9781560257141
Robert Allen spent ten years as the editorial director of Mensa Publications. He worked as director of Mensa Psychometrics, a company selling psychological testing to businesses and individuals, and has written many books in the field of popular psychology.Allen, Robert is the author of 'Cryptogram Challenge Over 150 Codes to Break and Ciphers to Break' with ISBN 9781560257141 and ISBN 1560257148.
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