30 205 26 206 25 | Chelsea, MI: Lewis Publishers, 1990 |
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Lake Michigan and Lake Huron form one hydrological unit; their surfaces are at the same elevation, and the water flows in either direction in the channel separating them | van der Leeden, Troise, and Todd, eds |
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95 179 754 180 748 181 702 182 692 | |
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