Monthly and yearly mean water levels with 10 year and all time averages.

Bibliographic Details
Corporate Author:	Canada. Marine Environmental Data Service
Format:	Serial
Language:	English
Published:	Ottawa : Dept. of the Environment, 197--
Subjects:	Hydrology > Canada. Water levels > Great Lakes (North America) Stream measurements > Canada. Hydrology. Stream measurements. Water levels. Canada. Great Lakes.
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Description
Physical Description:	volumes ; 22 x 27 cm
ISSN:	0318-5206