conservation of headstones and cemeteries

• @Millennial Stone Cleaner
  • ▶mating surfaces between two stones

authoritative

• National Park Service
  • "Preservation Brief 48: Preserving Grave Markers in Historic Cemeteries and Best Practice Recommendations for Cleaning Government Issued Markers"
• Strangstad, L. (2013). A Graveyard Preservation Primer. Germany: Rowman & Littlefield Publishers.
• Association for Gravestone Studies
• ? Gravestone Preservation.info & the Gravestone Preservation Directory