TY - BOOK ID - 133530675 TI - The history of the abacus PY - 1968 PB - London : Hutchinson, DB - UniCat KW - Abacus KW - Abaques (Mathématiques) UR - https://www.unicat.be/uniCat?func=search&query=sysid:133530675 AB - ER -