Boats were used to haul coal
<a rel="nofollow" class="external text" href="https://www.cdc.gov/niosh/">National Institute for Occupational Safety and Health (NIOSH)</a> from USA
2008-05-14 13:18
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/25069384@N03/2492848448/">Boats hauling coal</a> (ship is <i>United States Gypsum</i>, launched 1910, under this name 1939-1973<a rel="nofollow" class="external autonumber" href="http://greatlakes.bgsu.edu/vessel/view/007615">[1]</a>)