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![Cover for Erna Yackel · A Journey in Mathematics Education Research: Insights from the Work of Paul Cobb - Mathematics Education Library (Paperback Book) [2011 edition] (2013)](https://imusic.b-cdn.net/images/item/original/586/9789400734586.jpg?erna-yackel-2013-a-journey-in-mathematics-education-research-insights-from-the-work-of-paul-cobb-mathematics-education-library-paperback-book&class=scaled&v=1526643871)