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This reporting was published in partnership with NHPR , a nonprofit public media newsroom based in New Hampshire.

Erin Moulton’s interest in genealogy was casual at first. It started when people began stopping by her desk at the Derry Public Library with questions about the 198-year-old New Hampshire town’s history or for help looking up their ancestors.

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Moulton, 43, soon developed an obsession with solving these history puzzles, chasing a “geeky” kind of rush.

“I’ll go flying through the archives. I’ll be diving through the newspapers. I think it’s exhilarating,” Moulton said. “It’s like overturning treasure — another clue brings you to another clue brings you to another clue. And t

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