Numeration - Schurrer, Augusta L. (Ann Arbor, Michigan : Board of Trustees of the Leland Stanford Junior University, 1965)
Teacher's commentary. Ann Arbor, Mich.? Board of Trustees of the Leland Stanford Junior University, 1965. 29 p. ilus. 26 cm. (Supplementary and enrichment series, 15)
Keywords: TEORIA DE LOS NUMEROS