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1 Mark		Rabdologia, or, The art of numbring by rods : whereby the tedious operations of multiplication, and Partridge, Seth, 1603-1686. London : Printed by Robert White, and are to be sold by John Partridge ..., 1648. Access this resource online	1648 EBOOKS

Relevant titles entries 2-3

2 Mark		The art of numbring by speaking rods, vulgarly termed Nepeirs bones : by which the most difficult pa Leybourn, William, 1626-1716. London : Printed by T.B. for H. Sawbridge ..., 1685. Access this resource online	1685 EBOOKS

3 Mark		The art of numbring by speaking-rods, vulgarly termed Nepeirs bones : by which the most difficult pa Leybourn, William, 1626-1716. London : Printed for G. Sawbridge and are to be sold at his house ..., 1667. Access this resource online	1667 EBOOKS