Paul GreenHow to Use a Chinese Abacus: A Step-by-Step Guide to Addition, Subtraction, Multiplication, Division, Roots and More

How To Use A Chinese Abacus: A step-by-step guide to addition, subtraction, multiplication, division, roots and more.

Vintage Chinese Wooden Bead Arithmetic Abacus W. Instruction

Chinese Abacus: Practical step-by-step Guide