| Ernest Hallen 517 1/2 - K. Upper Locks, Gatun, Showing 208 1/2 ft. of East Side Wall Completed. April 1, 1910. 1910, 1 April Gelatin silver print George A. Smathers Libraries, University of Florida Panama Canal Museum Collection, Resource Identifier: accession number - 2013.8.100, System ID: AA00017879:00001 LL/58003
| |