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LE W. L. [Leybourn, William]
The Art of Numbring by Speaking-Rods: Vulgarly termed Nepeir's Bones. By which the most difficult parts of Arithmetick, As Multiplication, Division, & Extracting of Roots both square and cube are performed with incredible Celerity and Exactness (without any charge of the Memory) by Addition and Subtraction only
London, 1667. Lewis Evans Collection
[1924-0]
1667