To the untrained eye, the screen looks like random static. But Bob Perry points to a white blip that could be a coffin. And a series of impressions at the top of the monitor may be headstones.

Using ground-penetrating radar, Perry has been able to identify burials in Sudbury’s oldest cemetery that have been forgotten for centuries. Over the past two weeks, he’s located 967 gravesites in all, including about 70 buried headstones.

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