Maurice L. Hartung, Henry Van Engen & Helen Palmer.
Number system, consisting of 54 individual cards & a teacher's guidebook. (Arithmetic readiness cards, set 2)
R663384. Number system, consisting of 54 individual cards & a teacher's guidebook. By Maurice L. Hartung, Henry Van Engen & Helen Palmer. (Arithmetic readiness cards, set 2) © 25May50; AA152712. Scott, Foresman and Company (PWH); 31May77; R663384.
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