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robj_1971: Spicket Falls Dam, Methuen, MA.
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robj_1971: 30 Seconds
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robj_1971: 20 Seconds
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robj_1971: 10 Seconds
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robj_1971: 1 Second
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robj_1971: 1 Second
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robj_1971: 20 Seconds
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robj_1971: 30 seconds
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robj_1971: Underneath the Old North Bridge in Concord, MA
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