Bunker Hill Smelter, operating in the 1970s
U.S. Environmental Protection Agency
2011-06-14
<a rel="nofollow" class="external text" href="http://yosemite.epa.gov/r10/cleanup.nsf/8065e3cf3d5268538825778300663abc/c0379664d0efcd368825690000774cdc!OpenDocument">"Bunker Hill Photos"</a>