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• 12:55, 30 June 2011 Walkerma (talk | contribs) approve-ia ((automatic) [Accuracy: Sighted, Depth: Basic, Readability: Acceptable])
• 12:55, 30 June 2011 Walkerma (talk | contribs) uploaded File:EnvelopeHouse03.png (1983? newspaper article about an envelope house in Potsdam, NY - shows a diagram of how the house works. Used under fair use. Category:Chemistry 321 Category:Copyrighted material)