F. B. Knight & J. W. Studebaker. NM; new design for covers, revisions & additions.
Self-help arithmetic workbook 6.
R658458. Self-help arithmetic workbook 6. By F. B. Knight & J. W. Studebaker. NM; new design for covers, revisions & additions. © 22Mar50; AA147743. Scott, Foresman and Company (PWH); 28Mar77; R658458.
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