Probably more than you'd want to know.

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I suppose that reading a book on marginalia should be considered an acquired taste. Not everybody is going to find it fascinating reading. Then again, in the last decade there have been books published that examine footnotes, bookshelves, libraries, a history of reading, and much more that through getting into the details shed fascinating light on such a supposedly daily and common activity such as reading.

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Go to: Is there marginalia for sale on e-bay?, or
Go to: In the margins of cyberspace.