Proceedings: Third International Symposium on the North American Vertical Datum, NAVD symposium '85, Rockville, Maryland, April 21-26, 1985

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National Geodetic Information Center, NOAA, 1985 - Science - 480 pages
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Status of Vertical Control Networks 1n Canada
Great Lakes Vertical Control
Status of NGS North American Vertical Datum NAVD Project

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