Another reference: Conservation of Cast Zinc Sculptures in Outdoor Exposure, P.Mottner, H. Burckner, and J. Freitag, Metal 95,pp251-255, James & James, 1997
and slightly more esoteric-
Metals in America's Historic Buildings, Uses and Preservation Treatments, Gayle, Look and Waite. U.S. Department of the Interior National, Park Service, Washington, 1992.
I believe there are also related papers in some of the ICCROM publications but I don't have the references handy at the moment.
Susan Stock
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