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In my browsing through high school and elementary school textbooks, I've found (aside from the occasional open access text) that facing pages often look to be designed as a unit taking advantage of the full width of the text with tight integration of main text, images, diagrams and textboxes. This makes them particularly ill-designed for ebook format, including PDF's where information is given at most one page at a time.
It is no surprise that student reading such a text on a screen would have problems retaining as much as a student reading the text as it was designed to be read.
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