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Continue to ChatDam Number 4 East Woods Map - Cook County, IL https://www.yellowmaps.com/usgs/topo.cfm?map=il-424811-dam-number-4-east-woods
Dam Number 4 East Woods Map - Cook County, IL https://www.yellowmaps.com/usgs/topo.cfm?map=il-424811-dam-number-4-east-woods