80-G-88931:  USS Yorktown (CV 5).  Test location of portable radio direction finders.  Photograph released February 4, 1938.      Official U.S. Navy photograph, now in the collections of the National Archives.  (2016/09/27).
<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@N06/29345235473/">80-G-88931</a>