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:
Keystone Pk drawing. Three view drawings of Navy Keystone PK flying boat Keystone Aircraft produced Naval Aircraft Factory PN under licence as PKs These aircraft served with patrol squadron VPF at Naval Air Station Ford Island from to Navy Naval History Center Dictionary of American Naval Aviation Squadrons Volume The History