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http://education.jlab.org/itselemental/ele024.html
http://www.lenntech.com/periodic/elements/cr.htm
http://geology.com/minerals/chromite.shtml
https://www.mineralseducationcoalition.org/minerals/chromium
https://en.wikipedia.org/wiki/Chromite
http://education.jlab.org/itselemental/ele028.html
http://www.lenntech.com/periodic/elements/ni.htm
http://www.nickelinstitute.org/NickelUseInSociety/AboutNickel/HowNickelIsProduced.aspx
http://www.lenntech.com/periodic/elements/mo.htm
http://www.imoa.info/molybdenum/molybdenum-mining-processing.php
http://education.jlab.org/itselemental/ele042.html
http://investingnews.com/daily/resource-investing/industrial-metals-investing/molybdenum-investing/world-class-molybdenum-deposits/
http://www.eoearth.org/view/article/154667/