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SURFACE LEVELS OF THE GREAT LAKES

CURVES OF ANNUAL MEANS OF

EACH LAKE FROM 1860 TO 1910.

YEARS.

Levels in feet above

Mean Tide

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Under direction of Brigadier General W. H. BIXBY, Chief of Engineers, Washington, D. C., November, 1911 Drawn in Office of US Lake Survey. Based upon Records of the Lake Survey and other US Engineer Offices.

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SURFACE LEVELS OF LAKE SUPERIOR

AT MARQUETTE, MICH.

Curve of Annual Means from 1860 to 1910

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SURFACE LEVELS OF LAKE HURON AT HARBOR BEACH, MICH.

Curve of Annual Means from 1875 to 1910.

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