Mathematics of the Incas : code of the quipu /Author: Ascher, Marcia,
Publisher: Mineola, N.Y. : Dover Publications,
Date: 1997. This title can be found in 1 Iowa libraries.
The quipu and Peruvian civilization /Author: Swanton, John Reed,
Publisher: [Washington] : [U.S. G.P.O.],
Date: [1943] This title can be found in 1 Iowa libraries.
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