An unidentified <a href="//commons.wikimedia.org/wiki/Lake_freighter" title="Lake freighter">lake freighter</a> of the Canadian Steamship Lines entering Duluth Ship Canal in <a href="//commons.wikimedia.org/wiki/Duluth,_Minnesota" title="Duluth, Minnesota">Duluth, Minnesota</a>
US Army Corps of Engineers, photo by Jerry Bielicki
Taken in August 1988 (<a rel="nofollow" class="external text" href="http://web.archive.org/web/19970806085458/http://www.epa.gov/glnpo/image/viz_com4.html">archived source</a>)
<a rel="nofollow" class="external free" href="http://www.epa.gov/glnpo/image/viz_com4.html">http://www.epa.gov/glnpo/image/viz_com4.html</a>