| http://www.w3.org/ns/prov#value | - The U.S. Dept. of Commerce says Arizona exports overall dropped 30% from 2008 to 2009, but mining materials and commodities, including copper, dropped from $1.3 billion to $393 million (Bizjournals), which by my calculation is a drop of 70%. [photo credit, Freeport McMoRan]
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