80-CF-4428-1:   PBM-1, March 8, 1939.  U.S. Navy Photograph, now in the collections of the National Archives.  (2016/03/29).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/127906254@N06/25517680334/">80-CF-4428-1</a>