The Slide Rule a Practical Manual by Pickworth, Charles N, Like New Used, F

The Slide Rule a Practical Manual by Pickworth, Charles N, Like New Used, F

The Slide Rule a Practical Manual by Pickworth, Charles N, Like New Used, F

The Slide Rule; a Practical Manual by Pickworth, Charles N.

The Slide Rule a Practical Manual by Pickworth, Charles N, Like New Used, F

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