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http://digfir-published.macmillanusa.com/friedlandapes2e/friedlandapes2e_ch13_2.htmlmodule 37 Conservation, Efficiency, and Renewable Energy
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http://digfir-published.macmillanusa.com/friedlandapes2e/friedlandapes2e_ch13_5.htmlmodule 38 Biomass and Water
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http://digfir-published.macmillanusa.com/friedlandapes2e/friedlandapes2e_ch13_7.htmlmodule 39 Solar, Wind, Geothermal, and Hydrogen
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