The Repair, Replacement, and Maintenance of Historic Slate Roofs (Preservation Brief 29)
book
by Jeffrey S. Levine.
U.S. Department of the Interior, National Park Service, Cultural Resources, 1993.
This brief describes the history of slate use in the United States and explains the architectural character it provides to buildings. It discusses the deterioration and maintenance, repair, and replacement of slate roofs. It may be read online or ordered through the National Park Service.