The effect of selected cleaning techniques on Berkshire Lee marble : a scientific study at Philadelphia City Hall
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書誌事項
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
機械可読データファイル（光ディスク）
- タイトル別名
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Scientific study at Philadelphia City Hall
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GPOCN:I 19.16:1635/CD
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Shipping list no.: 2003-0003-E
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