Visit the Burton Historical Collection at the Detroit Public Library. It was woefully low-tech last time I was there but the reference librarians are very helpful!
https://detroitpubliclibrary.org/res...cal-collection
https://digital.library.wayne.edu/search?q=cadieux+cafe
There's a couple images there.
https://digitalcollections.detroitpubliclibrary.org/
May have some images.
Good luck! I lived a couple blocks from the Cadieux Cafe for years. Many good times there, though the food was very sub-par in recent years. I hope the new owners do some fancy gastropub stuff and otherwise just keep the gem polished.
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