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  1. 1

    The Japanese abacus explained. by Yoshino, Yozo

    Published 1963
    Book
  2. 2

    The history of the abacus by Pullan, J. M.

    Published 1969
    Book
  3. 3
  4. 4

    A study of the basic theory and application of the Chinese abacus. by Chen, Yun Chang

    Published 1970
    Thesis Book
  5. 5

    Magic squares and more / by Owen, Claire

    Published 2005
    Book