National Geophysical Data Center (1996). "Bathymetry of Lake Michigan". National Oceanographic and Atmospheric Administration. doi:10.7289/V5B85627. Diakses tanggal March 23, 2015. (only small portion of this map)
National Geophysical Data Center (1999). "Bathymetry of Lake Ontario". National Oceanographic and Atmospheric Administration. doi:10.7289/V56H4FBH. Diakses tanggal March 23, 2015. (only small portion of this map)
National Geophysical Data Center (1996). "Bathymetry of Lake Michigan". National Oceanographic and Atmospheric Administration. doi:10.7289/V5B85627. Diakses tanggal March 23, 2015. (only small portion of this map)
National Geophysical Data Center (1999). "Bathymetry of Lake Ontario". National Oceanographic and Atmospheric Administration. doi:10.7289/V56H4FBH. Diakses tanggal March 23, 2015. (only small portion of this map)
National Geophysical Data Center (1999). "Bathymetry of Lake Superior". National Oceanographic and Atmospheric Administration. Diakses tanggal March 23, 2015. (the general reference to NGDC because this lake was never published, compilation of Great Lakes Bathymetry at NGDC has been suspended). (only small portion of this map)