This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
USS Ulua SS and USS Trumpetfish SS under construction. Ulua SS The United States Navy submarines left and right under construction at the Cramp Shipbuilding Company at Philadelphia Pennsylvania Scanned from Page of Friedman Norman Submarines Through An Illustrated Design History Annapolis Maryland Naval Institute Press ISBN United