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I can't find the links right now, but I do know that line-length* has been studied and there are optimal lengths (from vague memory it was between 50 and 70 characters per line for most people). This is one of the reasons why books with fine print can cause difficulties, it's not just the font size but also the number of words on the line.
* line length as the number of words or characters per line rather than margin width, although obviously you can manage the former with the latter, but you can also do it by adjusting the font size
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