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Nothing beats the real thing, but if you want a look at digitized versions of tons of typography-related books from past centuries, check out Google Books, if you haven't already. Most 20th century stuff remains under copyright protection, and thus a "full view" isn't available. But even as someone who spends a lot of time in online databases, I was pretty astonished at what's available in a full-text version. I wonder if links to a number of books could be assembled into a kind of virtual library for this Typophile.com?