Another example: Hirschhorn's book on model categories was available for free on his website before the published version came out. I have the pdf from his website. Would it be inappropriate to link that sort of thing.
]]>I think it would be just nice to know.
Motivation: http://mathoverflow.net/questions/19526/reference-request-for-a-well-known-identity-in-a-paper-of-shepp-and-lloyd
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