Try doing a search for, "submarine squadrons and divisions WWII"
There were Submarine Divisions as well as Squadrons (Subron's)
Many results, also, a virtual trip to your library may be productive once you find books about operations. My library will order books from other regional, State, and national library's if they don't have the books I want.
Then, there is Amazon & Google books, sites like that, and don't forget submarine museums.
Good luck sailor.
Happy Hunting!
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