Start with high-confidence warships & submarines books, then narrow by subgenre or adjacent topics.
Red Star Rogue
Kenneth Sewell, Clint Richmond
The World Encyclopedia of Submarines
John Parker, Francis Crosby
Submarine Aircraft Carriers
Jacob Gunnarson, Norman Polmar
Royal Navy Monitors of World War II
Angus Konstam, Adam Tooby
United States Navy Submarines 1900-2019
Michael Green
Hitler's Attack U-boats
Jak P. Mallmann Showell
Submarines
David Ross
World War II Encyclopedia of Aircraft, Tanks & Warships
Chris McNab
