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1.
The calculator puzzle book / by Claude Birtwistle. by
Material type: Text Text
Publication details: New York : Bell Pub. Co., c1978
Availability: Items available for loan: DIS Library (1)Call number: 793.74 Birtwis.

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2.
Detectograms and other puzzles / by H.A. Ripley and F. Gregory Hartswick. by
Material type: Text Text
Publication details: New York : Bell Pub. Co. : Distributed by Crown Publishers, 1983, c1968
Availability: Items available for loan: DIS Library (1)Call number: 793.73 Ripley.

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