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bench-marks-and-levelling-points/
bench-marks-and-levelling-points/
http://www.heritageandhistory.com/contents1a/2010/05/bench-marks-and-levelling-points/
Benchmark (surveying)
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bench-marks-and-levelling-points/
http://www.heritageandhistory.com/contents1a/2010/05/bench-marks-and-levelling-points/