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000057116 1001_ $$aAshlock, Robert B.,$$d1930-
000057116 24510 $$aError patterns in computation;$$ba semi-programmed approach$$c[by] Robert B. Ashlock.
000057116 260__ $$aColumbus, Ohio,$$bMerrill$$c[1972]
000057116 300__ $$avii, 103 p.$$billus.$$c25 cm.
000057116 504__ $$aIncludes bibliographical references.
000057116 650_0 $$aArithmetic$$xStudy and teaching (Elementary)
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