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U (Stack)Pickworth, Charles N.
Instructions for the Use of A. W. Faber's Improved Calculating Rules
London: A. W. Faber, n.d. Together with two leaflets: Instructions for the Use of A. W. Faber's Improved Calculating Rule; and Instructions for the Use of A. W. Faber's Calculating Rule no. 378 for Electrical and Mechanical Engineers (both London: A. W. Faber, n.d.). (Includes a price list of A. W. Faber calculating rules, pp. 55-58, and (following on from that, but unpaginated) an 8-page catalogue of A. W. Faber pencils and rubbers). Transferred to Bodleian, September 2017.
[1985-126]
[n.d.]