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https://www.yellowmaps.com/usgs/places.cfm?latdec=38&londec=-90&fname=Southeast%20coordinates%20of%20Prairie%20Du%20Rocher&fclass=Topo%20Map&st=IL&county=United%20States&el=---&quad=Prairie%20Du%20Rocher&quadid=38090a1
Southeast coordinates of Prairie Du Rocher Map - IL, United States
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