The Coal Creek dredge, Yukon-Charley Rivers National Preserve, Alaska, USA
Josh Spice, National Park Service
<a rel="nofollow" class="external free" href="http://www.nps.gov/yuch/planyourvisit/images/Coal-Creek-Dredge-b-w-HDR-688x.jpg">http://www.nps.gov/yuch/planyourvisit/images/Coal-Creek-Dredge-b-w-HDR-688x.jpg</a>