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Start Over Object class Data processing equipment Collection place Northern China
Hearst Museum object titled Abacus rules, accession number 9-21432a-d, described as Abacus rules in two volumes (second volume now in pieces). Paper, stitched. 13.5 x 20.5 cm. a) Single plain piece of paper, apparently back cover to second of two volumes. b) One volume with pink cover sheet, intact. c) Main pages of second volume. d) Pink cover for second volume.

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