"Copyright 1901 by Baird Halberstadt. This map is based upon the author's map made for the Geological Survey in 1891" Covers the western half of Pennsylvania Includes ...
CHICAGO | When an interstate bridge between Springfield and Champaign began to sink three years ago, the cause was quickly identified: An old coal mine 220 feet below the surface was starting to give ...
Maryland’s largest active underground coal mine changed hands last month after its previous operator, Canadian firm Corsa Coal, filed for bankruptcy and auctioned its assets to pay creditors. The new ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback