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Oracle Mind Games and Puzzles

by Harold Gale

ISBN 13: 9781872122304

Format: Paperback (96 pages)
Publisher: Mensa Publications Ltd
Published: 27 Apr 1990

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Q-challenge Brainbusters

by Harold Gale

ISBN 13: 9780859854757

Format: Hardcover (32 pages)
Publisher: Price Stern Sloan,US
Published: May 1988

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Number Puzzles for Math Geniuses (Mensa Publications Presents)

by Harold Gale

ISBN 13: 9780812922141

Format: Paperback
Publisher: Times Books
Published: Jun 1993

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