The researchers used ground penetrating radar to find at least 50 grave sites at the Arthur G Dozier School for Boys and said there could be more yet to be discovered. Evidence of other deaths was established by using archive records, other historical documents and interviews with relatives.

An investigation four years ago by Florida police that relied on the school's own records had reported that 81 died at the school, of whom 31 were buried on the property at a cemetery marked with white metal crosses.

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