"Geophysical Lake Michigan". US Environmental Protection Agency. September 25, 2015. Archived from the original on January 12, 2019. Retrieved March 16, 2017.
great-lakes.net
"Lake Michigan". Great-lakes.net. June 18, 2009. Archived from the original on January 1, 2010. Retrieved January 14, 2010.
National Geophysical Data CenterArchived April 3, 2015, at the Wayback Machine, 1999. Bathymetry of Lake Huron. National Geophysical Data Center, NOAA. doi:10.7289/V5G15XS5 [access date: March 23, 2015]. (only small portion of this map)
"About Our Great Lakes: Tour". National Oceanic and Atmospheric Administration (NOAA), Great Lakes Environmental Research Laboratory (GLERL). Archived from the original on May 7, 2017. Retrieved December 15, 2017.
Great Lakes Shipping Study(PDF) (Report). U.S. Department of Homeland Security. January 13, 2014. Archived from the original(PDF) on November 11, 2020. Retrieved May 30, 2018.
National Geophysical Data CenterArchived April 3, 2015, at the Wayback Machine, 1999. Bathymetry of Lake Huron. National Geophysical Data Center, NOAA. doi:10.7289/V5G15XS5 [access date: March 23, 2015]. (only small portion of this map)
"About Our Great Lakes: Tour". National Oceanic and Atmospheric Administration (NOAA), Great Lakes Environmental Research Laboratory (GLERL). Archived from the original on May 7, 2017. Retrieved December 15, 2017.
"Lake Michigan". Great-lakes.net. June 18, 2009. Archived from the original on January 1, 2010. Retrieved January 14, 2010.
"Geophysical Lake Michigan". US Environmental Protection Agency. September 25, 2015. Archived from the original on January 12, 2019. Retrieved March 16, 2017.
Great Lakes Shipping Study(PDF) (Report). U.S. Department of Homeland Security. January 13, 2014. Archived from the original(PDF) on November 11, 2020. Retrieved May 30, 2018.