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by Young, Hugh D.; Freedman, Roger A.
by Temple-Raston, Dina
by University of St. Thomas; Cory, Catherine A.; Landry, David T.
by University of Chicago School Mathematics Project
by Young, Hugh D.
by Gaines, James R.
by Young, Hugh D.; Freedman, Roger A.; Sears, Francis Weston; et al.
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