United States Department of the Interior, Fred A. Seaton, Secretary 
Fish and Wildlife Service, Arnie J. Suoemla, Commissioner 
SOURCES OF HYDROGRAPHIC AND METERIOLOGICAL DATA 
ON THE GREAT LAKES 
by 
Charles F, Powers and David L. Jones 
Research Associates 
and 
John C,. Ayers, Project Director 
Great Lakes Research Institute 
University of Michigan 
Ann Arbor, Michigan 
U. S. Fish and Wildlife Service 
Contract No. 14-19-008-9381 
United States Fish and Wildlife Service 
Special Scientific Report--Fisheries No. 314 
Washington, D. C. 
July 1959 
