Copper

http://en.wikipedia.org/wiki/Copper (Rank: 158949)

http://www.chemicalelements.com/elements/cu.html (Rank: 496706)

http://environmentalchemistry.com/yogi/periodic/Cu.html (Rank: 514934)

http://education.jlab.org/itselemental/ele029.html (Rank: 735502)

http://library.lanl.gov/cgi-bin/getfile?rc000048.pdf (Rank: 941592)

http://minerals.usgs.gov/minerals/pubs/commodity/copper/ (Rank: 1399412)

http://www.lenntech.com/Periodic-chart-elements/Cu-en.htm (Rank: 1612825)

http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e02900.html (Rank: 2139764)

http://www.webelements.com/webelements/elements/text/Cu/key.html (Rank: 2158573)

http://periodic.lanl.gov/elements/29.html (Rank: 2161149)

http://www.chemsoc.org/viselements/pages/copper.html (Rank: 2390828)

http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/29.html (Rank: 2824277)

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