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History
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Meades Ranch Triangulation Station, fundamental station for the North American Datum of 1927
Meades Ranch Triangulation Station, fundamental station for the North American Datum of 1927
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City of Chicago Datum Benchmark
City of Chicago Datum Benchmark
The Great Trigonometrical Survey of India, one of the first surveys comprehensive enough to establish a geodetic datum.
The Great Trigonometrical Survey of India, one of the first surveys comprehensive enough to establish a geodetic datum.