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![Cover for Leslie P. Steffe · Children's Fractional Knowledge (Paperback Book) [2010 edition] (2014)](https://imusic.b-cdn.net/images/item/original/661/9781489984661.jpg?leslie-p-steffe-2014-children-s-fractional-knowledge-paperback-book&class=scaled&v=1544424110)
![Cover for Leslie P. Steffe · Construction of Arithmetical Meanings and Strategies - Recent Research in Psychology (Paperback Book) [Softcover reprint of the original 1st ed. 1988 edition] (1987)](https://imusic.b-cdn.net/images/item/original/885/9780387966885.jpg?leslie-p-steffe-1987-construction-of-arithmetical-meanings-and-strategies-recent-research-in-psychology-paperback-book&class=scaled&v=1409749579)