Time and frequency user's manual / 
edited by George Kamas and Sandra L. Howe 
 - Washington, D.C. :  U.S. Government Printing Office,  1979 
 - xvi, 248 p. ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrology--United States<br/>Frequency curves--United States
<br/><br/><label>Dewey Class. No.: </label>551.480973