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![Cover for William H. Schmidt · Characterizing Pedagogical Flow: An Investigation of Mathematics and Science Teaching in Six Countries (Paperback Book) [2002 edition] (1996)](https://imusic.b-cdn.net/images/item/original/731/9780792342731.jpg?william-h-schmidt-1996-characterizing-pedagogical-flow-an-investigation-of-mathematics-and-science-teaching-in-six-countries-paperback-book&class=scaled&v=1410147868)