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-   -   Many critical elements difficult to substitute (http://www.alternative-energy.com.au/forum/showthread.php?t=9871)

Sparty 01-07-2014 06:38 AM

Many critical elements difficult to substitute
 
http://www.rsc.org/chemistryworld/si...-Fig5_630m.jpg
Good substitutes for elements used in modern technology don't exist: NAS


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