Great Lakes Diving Guide (2008) by Chris Kohl. If you or anyone has any other suggestions, I'm open!
That’s an excellent one. Now for non-diving wreck stores, Great Lakes Shipwrecks and Survivals by William Ratigan. Originally published in 1960, it was revised after the Fitz went down in 1975. This is what got me started on my shipwreck passion in 1991.
Any of the books by Michael Schumacher are excellent. I especially like his book on the White Hurricane of 1913, probably the worst storm to ever hit the Great Lakes. Something like eight lakers went to the bottom just on Lake Huron. His book on the Carl D. Bradley includes a chapter on the sinking of the Cedarville in the Straits in 1965. She and the Bradley were fleetmates. The Cedarville is a popular dive site.
For good general background, The Long Ships Passing by Walter Havighurst is good. It was originally published in the 1940s