Teaching elementary school mathematics for understanding [by] John L. Marks, C. Richard Purdy [and] Lucien B. Kinney.
By: Marks, John L.
Contributor(s): Purdy, Charles Richard | Kinney, Lucien B. (Lucien Blair), b. 1895. Kinney, Lucien B. (Lucien Blair), b. 1895.
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