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Image of Great Lakes taken from space at night. |
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Key to Map: Coniferous Forest | Mixed-Wood Forest | Deciduous Forest | Low-Intensity Farming/Pasture | Intensive General Farming | Urban Areas
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The United States Geological Survey and Canadian Hydrologic Survey maintain an extensive network of stream gages, many of which have recorded daily stream flow for up to a Century. |
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A preliminary hydrogeography of flow regimes of Great Lakes basin.
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