Preservation Brief 29, by Jeffrey S. Levine
Online Version:
The Repair, Replacement and Maintenance of Historic Slate Roofs
PDF Version:
https://www.nps.gov/tps/how-to-preserve/preservedocs/preservation-briefs/29Preserve-Brief-SlateRoofs.pdf
Preservation Brief 29, by Jeffrey S. Levine
Online Version:
The Repair, Replacement and Maintenance of Historic Slate Roofs
PDF Version:
https://www.nps.gov/tps/how-to-preserve/preservedocs/preservation-briefs/29Preserve-Brief-SlateRoofs.pdf