Guillaume Henri Dufour
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What links here
Vertical deflection
Gravity anomaly
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U.S. National Geodetic Survey
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Dynatron oscillator
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Prime meridian (Greenwich)
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World Geodetic System
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Figure of the Earth
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Prime meridian
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Zenith
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Metre Convention
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Latitude
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Longitude
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Hollow Earth
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Declination
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International Bureau of Weights and Measures
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