Guy T. Buswell & Maurice L. Hartung.
Arithmetic 1949. (Supplementary educational monographs, no. 70)
R647763. Arithmetic 1949. By Guy T. Buswell & Maurice L. Hartung. (Supplementary educational monographs, no. 70) © 11Nov49; AA134174. The University of Chicago (PWH); 29Nov76; R647763.
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