Bathymetry of Lake Erie and Lake St. Clair
NOAA
<a rel="nofollow" class="external free" href="https://www.glerl.noaa.gov/pubs/brochures/LakeErieBathyPoster.pdf">https://www.glerl.noaa.gov/pubs/brochures/LakeErieBathyPoster.pdf</a>