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campbell, OH USGS Benchmark |
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Campbell Hill Ohio |
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Greylock Lighthouse |
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Greylock Stream |
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Greylock - FOcker |
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Jerimoth Hill RI |
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Jerimoth Hill RI |
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Jerimoth HIll RI |
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Katahdin, Maine |
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Mauna Kea, USGA bench |
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Mauna Kea Hawaii |