Matches in DBpedia 2016-04 for { ?s ?p <https://books.google.com/books?id=SXVEAAAAIAAJ&printsec=frontcover&dq=William+Graham+Sumner,+a+history+of+american+currency&hl=en&sa=X&ved=0CCwQ6AEwAWoVChMI05rby87tyAIVR-ljCh3lGgzN#v=onepage&q=William%20Graham%20Sumner%2C%20a%20history%20of%20american%20currency&f=false> }
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