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 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.