Sewarcy, James K. <br/><br/>
Time of travel of water in the Potomac river Cumberland to Washingto n /  
James K. Searcy and Luther C. Davis. 
 - Washington, D.C. :    The U.S. Geological Survey ,    1960. 
 - 12 p. :    ill. ;    27 cm. 
 - Geological Survey Circular ;    no.438 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Corporate Names: </label><br/> United States   Department of the Interior. 
<br/><br/><label>Gov. Doc. Class. No.: </label>G. U.S. I53 (08) 1/438