Book Principles Chinese Abacus
The Principles and Practice of the Chinese Abacus / Author Lau Chung Him / Published 1958 / Third edition 1964 / Printed in Hong Kong / English / ~316 pages
Personal collection of vintage and modern Abacuses / Abaci.
The Principles and Practice of the Chinese Abacus / Author Lau Chung Him / Published 1958 / Third edition 1964 / Printed in Hong Kong / English / ~316 pages