| http://www.w3.org/ns/prov#value | - However, not all materials are available for free and if you know that there is an item that you would be willing to pay for, especially if it is an obscure, out-of-print, or foreign language book or an article from a minor, out-of-print or foreign journal, please set the MaxCost higher than $0 in order to optimize processing time.
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