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

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U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, 1985 - Science - 480 pages
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Preface 111
Status of NGS1 North American Vertical Datum NAVD Project
Status of the Vertical Control Networks 1n Mexico

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