Comment FLP Sales (Score 1) 129
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I guess it also helps that it isn't a book that's been published recently - being an older title, sales are probably thin to begin with. An online copy can easily be a good marketing mechanism in that case.
Still is #55,812 rank in Amazon book sales and that is just for the 2011 3-book commemorative set! I'm sure that this clear and somewhat comprehensive physics treatise will sell well long after I'm gone!