As cicadas hum and trucks roar past, two figures move about 19th-century gravestones set into a little glade surrounded by farm fields just off Highway 30 and Skillman Road in rural Mount Vernon.

Gail Brown and her grandson, Dylan Kwaiser-Brown, both of Mount Vernon, take GPS readings on each of the tombstones, jotting down notes, calling out instructions or readings and conferring with each other as they struggle to identify the markings on the stones.

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