National Ocean Service (Continued) 
Great Lakes Water Levels--—1860-1980 
Publication Date 
or Interval: Every 5 years 
Location: Great Lakes 
Period of Coverage: 1860-1980 
Contents: Great Lakes Water Levels—-1860-1980 contains 258 pages of figures, 
a map, and a geographical index showing the network of over 50 permanent 
gages, and tabular records of monthly and annual average water surface eleva- 
tions for each gage for the period of its existence, as well as tables showing 
summaries of average and extreme levels. 
Available From: Distribution Branch, N/CG 33 
National Ocean Service 
National Oceanic and Atmospheric Administration 
Riverdale, MD 20/737 
(301) 436-6990 
III-13 
