The Gemmary, Inc.

P.O. Box 2560, Fallbrook, CA 92088, (760) 728-3321 rcb@gemmary.com

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  1. Thacher, E. - DIRECTIONS FOR USING THACHER'S CALCULATING INSTRUMENT

    Thacher, E. - DIRECTIONS FOR USING THACHER'S CALCULATING INSTRUMENT

    $15.00

    New York: Keuffel & Esser, 1917 (recent reprint) Learn More
  2. Poland, J. - SIMPLE RULES FOR USING THE SLIDE RULE

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