Dan, I used to work with a guy named Fred Stonehouse, he'd tell stories about wrecks over beers after drill, and was very knowledgeable about the shipping history of the lakes. It wasn't until years later that I found out he had his doctorate and had written several books. I haven't read any, but if they are anything his stories, they should be good. I watched a history channel special about Great Lakes shipping, and there was Fred as the expert they were interviewing. You may want to look him up.
Old70
Stonehouse - read several of his books. Boyer is great as well.
Chris Kohl has some good collections but they're geared towards divers who want to find and dive them but he does give a bit of history too.
Tons of info
HERELost and Found by VO Vanheest is good as is Shipwreck Hunter by Volgenau.
