RUCH, G. M.
Self-help arithmetic work-book, 8, by G. M. Ruch, F. B. Knight & J. W. Studebaker. Teacher's ed.
RUCH, G. M. Self-help arithmetic work-book, 8, by G. M. Ruch, F. B. Knight & J. W. Studebaker. Teacher's ed. © 19Nov40; AA350639. Scott, Foresman & Co. (PWH); 2Jan68; R426083.
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