Boardman, H. - Supplement to the P. I. C. book of instructions introducing the use of the P. I. C. direct and inverse log-log differential scales for finance calculations.

np, P. I. C. Slide Rules, nd. 28 pp. soft cover. Sdescription VG. Light soiling and shelf wear to covers, light soiling to page edges, overall very good condition. No Jacket.

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