Modernized abacus. Realia

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Modernized abacus. Realia

http://www.worldcat.org/oclc/20929461

1 wooden frame with 40 colored beads and 4 steel rods, 23 x 46 cm.

Plymouth State University

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SNAC Resource ID: 7002170

Plymouth State University

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Holt, Rinehart, and Winston, inc.

http://n2t.net/ark:/99166/w67t1j1q (corporateBody)