1. The art of numbring by speaking-rods : vulgarly termed Nepeirs bones : by which the most difficult Creator: Leybourn, William, 1626-1716 Published / Created: 1667 Call Number: QA75 L49 Image Count: 62 Description: Signatures: A6(A1 blank)B-E12(E10-11 blank; E12[blank?] wanting). Advertisements: p. [88-90]. Publisher: Printed for W. Hayes and are to be sold at his house in Moorfields, Subject (Name): Napier, John,--1550-1617 Subject (Topic): Arithmetic--Early works to 1800 and Calculators Found in: Beinecke Rare Book and Manuscript Library > The art of numbring by speaking-rods : vulgarly termed Nepeirs bones : by which the most difficult parts of arithmetick ... are performed with ... celerity and exactness ... / published by W.L.