Histories Vanish Along With South's Cemeteries
Old Mill Cemetery in Thomaston, Ga, is one of thousands in South being swallowed by development and neglect; Mississippi Heritage Trust, alarmed by destruction and distintegration of so many historic burial grounds, includes handful of them on list of state's most endangered places; weak laws and lax enforcement allow developers to bulldoze them and prevent vandals from being prosecuted; little money is available in state and county treasuries for upkeep; preservationists say most imperiled burial grounds are those historically used by blacks; poorly marked graves, neglected when people moved away, and lost tradition of cemetery tending are to blame, together with less vigilance by authorities in maintaining black cemeteries than white ones; photos (M)
