TY - BOOK AU - Pullan, J. M PB - F. A. Praeger TI - The history of the abacus / [by] J.M. Pullan KW - Abacus. CY - New York N1 - Bibliography: p. 116-120. PY - 1969 M1 - Accessed from https://nla.gov.au/nla.cat-vn1961213 ER -