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![Cover for A. Treffers · Three Dimensions: A Model of Goal and Theory Description in Mathematics Instruction - The Wiskobas Project - Mathematics Education Library (Paperback Book) [Softcover reprint of the original 1st ed. 1987 edition] (2012)](https://imusic.b-cdn.net/images/item/original/603/9789401081603.jpg?a-treffers-2012-three-dimensions-a-model-of-goal-and-theory-description-in-mathematics-instruction-the-wiskobas-project-mathematics-education-library-paperback-book&class=scaled&v=1550800048)
![Cover for A. Treffers · Three Dimensions: A Model of Goal and Theory Description in Mathematics Instruction — The Wiskobas Project - Mathematics Education Library (Hardcover Book) [Enlrgd&rev edition] (1986)](https://imusic.b-cdn.net/images/item/original/655/9789027721655.jpg?a-treffers-1986-three-dimensions-a-model-of-goal-and-theory-description-in-mathematics-instruction-the-wiskobas-project-mathematics-education-library-hardcover-book&class=scaled&v=1410618013)