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National Center for Preservation Technology and TrainingTechnology Serving the Future of America’s Heritage
www.ncptt.nps.gov/products© 2008 NCPTT
Protection of Metallic Monuments from Biodeterioration
Ralph MitchellSchool of Engineering and Applied Sciences
Harvard University
Image by Earl - What I Saw 2.0 on FlickrImage by Vicki & Chuck Rogers on Flickr