TY - BOOK AU - Pullan, J. M PB - Hutchinson TI - The history of the abacus [by] J. M. Pullan KW - Abacus. CY - London N1 - Facsims. on lining papers. N1 - Bibliography: p. 116-120. PY - 1968 M1 - Accessed from https://nla.gov.au/nla.cat-vn328584 ER -