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CONVERSION FACTORS AND VERTICAL DATUM <br />Muhlply By To obtain <br />foot (ft) 0.3048 meter <br />inch per year (in/yr) 25.4 millimeter per year <br />mile (mi) 1.609 kilometer <br />square mile (mil) 2.59 square kilometer <br />Degree Fahrenheit (°F) may be converted to degree Celsius (°C) by using the following equation: <br />Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929}-a geodetic datum derived <br />from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929. <br />VI CONTENTS <br />