KNIGHT, F. B.
Problem scale numbers 1-16 of arithmetic, by F. B. Knight & G. M. Ruch.
KNIGHT, F. B. Problem scale numbers 1-16 of arithmetic, by F. B. Knight & G. M. Ruch. © 3May33; AA120440. Scott, Foresman & Co. (PWH); 5Jan61; R268977.
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