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[| Making Solar Energy More Economical], National Academy of Engineering, accessed 22 September 2011 (Grand Challenge)

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−	[[http://www.engineeringchallenges.org/cms/8996/9082.aspx \| Making Solar Energy Economical]]	+	[[http://www.engineeringchallenges.org/cms/8996/9082.aspx \| Making Solar Energy More Economical]], National Academy of Engineering, accessed 22 September 2011 (Grand Challenge)