UNDERSTANDING NUMBERS SUPPLEMENT, by J. W. Studebaker, P. B. Knight, W. C. Findley & G. M. Ruch.
UNDERSTANDING NUMBERS SUPPLEMENT, by J. W. Studebaker, P. B. Knight, W. C. Findley & G. M. Ruch. © 29Nov44; AA470550. Scott, Foresman & Co. (PWH); 7Jan72; R521001.
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