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By WILLIAM NEUMAN and RALPH BLUMENTHALAUG. 13, 2014
CHEPÉN, Peru — A small remote-controlled helicopter buzzed over ancient hilltop ruins here, snapping hundreds of photographs. Below, stone walls built more than a thousand years ago by the Moche civilization gave way to a grid of adobe walls put up only recently by what officials said were land speculators.
“This site is threatened on every s…
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