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"Advantages of Using Molten Salt".Early fruit walls were built perpendicular to the ground and facing south, but over time, sloping walls were developed to make better use of sunlight.Retrieved 20 November 2016.The Solar Economy (Renewable Energy for a Sustainable Global Future).American Society of Heating, Refrigerating and Air-Conditioning Engineers.Archived from the original on Retrieved 29 September 2007."Passive solar heating simpler for the average owner".
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Department of Energy (DOE) in deployment and validation of PV systems for federal agencies, utilities, and other institutional users.
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