1. Michigan Bedrock Geology: Michigan
2015. Michigan Department of Natural Resources. Bedrock geology polygons as digitized from the 1987 Michigan Bedrock Geology map. Updated Monthly.
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2. Michigan Geology Bedrock: Michigan
2019. Michigan Department of Natural Resources. Michigan Geology Bedrock.
3. Base Flow of Michigan Streams: Michigan
2017. Michigan Department of Natural Resources. This data set provides estimates of the ground-water contribution to stream flow, frequently referred to as base flow, in cubic feet per second. Th...