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1
Quipu y Yupana : colección de escritos /
by Altieri, Andrés Radamés
Published 1990
Book
2
How to use Soroban
Book
3
The history of the abacus /
by Pullan, J. M.
Published 1970
Book
4
Number words and number symbols : a cultural history of numbers
Book
5
The abacus: a pocket computer /
by Dilson, Jesse, Dilson, Jesse
Published 1968
Book
6
Abacus arithmetic : how to perform some calculations on the chinese abacus /
by Crook, Welton J., Crook, Welton J.
Published 1958
Book
7
Juego del ábaco /
Book
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