Great Lakes water levels, 1860-1990 :  monthly and annual average water surface elevations / 
[Office of Oceanography and Marine Assessments]. 
 - [Rockville, Md.] :  U.S. National Oceanic and Atmospheric Administration. National Ocean Service,  1992. 
 - 243 p. ;  25 cm. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Great Lakes--Water level.
<br/><br/><label>LC Class. No.: </label>GB1627.G8  / G743 1992 
<br/><br/><label>Gov. Doc. Class. No.: </label>C 55.420/2:860-90