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In the 61 years since Schliemann's death, archeology has become an elaborate and meticulous science. Borrowing tools from physics, chemistry and half a dozen other sciences, it has gone on to fresh triumphs in Egypt, Crete, Mesopotamia and Central America. Biggest items of unfinished business: the Inca civilization of Peru and Bolivia, the Hittite culture of Syria and Asia Minor, and the stone remains of the Indus Valley.