算盤 Advanced Abacus Techniques. Tutorial Instruction
League for Soroban Education of Japan Manual (60 pages, 8.76 mb PDF File) Manual in Spanish (12 pages, 477 kb PDF File). Magazines and Periodicals The Abacus, in its Historic and Scientific Aspects (1.97 mb PDF File) - by Cargill G. Knott, D. Sc. [Edin.], F. R. S. E. [December 16th, 1885] Retyped version of Knott's article. Thanks to Nanami ...
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