| http://www.w3.org/ns/prov#value | - That shouldn???t be a surprise, Amazon or other sellers aren???t going to sell a book from any period that???s utility doesn???t exceed it???s price for enough buyers to earn a return on their time. 1850s books are out of copyright and thus ???for sale??? in kindle form for free (Amazon???s goal seems to be to drive kindle interest and interest in modern books as well) or nominal cost, meaning tha
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