The effect of selected cleaning techniques on Berkshire Lee marble : a scientific study at Philadelphia City Hall
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The effect of selected cleaning techniques on Berkshire Lee marble : a scientific study at Philadelphia City Hall
（Geological Survey professional paper, 1635）
U.S. Dept of the Interior, U.S. Geological Survey, 2002
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Scientific study at Philadelphia City Hall
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GPOCN:I 19.16:1635/CD
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Summary: A scientific investigation of the effects of eight different cleaning techniques on the Berkshire Lee marble component of the facade of the East Center Pavilion at Philadelphia City Hall. The eight cleaning techniques evaluated were power wash, misting, gommage, combination, Armax, JOS, laser, and dry ice