A 3 sided view of the PBY-6A Catalina with additional views added for several variants from the same document as well as the armament, armor and tank locations.
Bureau of Aeronautics, U.S. Navy
U.S. Navy Naval Historical Center <a rel="nofollow" class="external autonumber" href="https://www.history.navy.mil/content/history/nhhc/research/histories/naval-aviation-history/naval-aircraft/patrol-aircraft/pby-6a-catalina-wwii.html">[1]</a>