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United States Coast Guard Marine Safety Bulletins
U.S. Coast Guard Sector Lake Michigan
U.S. Coast Guard 9th District
U.S. Coast Guard Auxiliary
Illinois Department of Natural Resources
Amalgamated International and U.S. Inland Navigation Rules
Maritime Safety Information Publications
USCG Lights List
Coast Pilot
Coast Pilot 6
USGS Streamflow Gauges for Illinois
H2ONOW Chicago Real Time Water Quality Monitoring
National Weather Service Chicago