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<br />CONVERSION FACTORS <br /> <br />Inch-pound units in this report may be converted to metric units (Inter- <br />national System) by using the following conversion factors: <br /> <br />foot <br />mile <br />square mile (mi2) <br /> <br />By <br /> <br />0.3048 <br />1. 609 <br />2.590 <br /> <br />To obtain metric unit <br /> <br />Multiply inch-pound unit <br /> <br />meter <br />kilometer <br />square kilometer <br /> <br />Sea level: In this report "sea level" refers to the National Geodetic <br />Vertical Datum of 1929 (NGVD of 1929)--a geodetic datum derived from a general <br />adjustment of the first-order level nets of both the United States and Canada, <br />formerly called "Mean Sea Level of 1929." <br /> <br />iv <br />