154 Scientific Intelligence. 
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engineers. About twenty square miles, including the Wyoming 
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since by Professor Lesley. Such investigations, besides aiding 
the miner, give a closely approximate idea of the amount of ca" 
In a scientific way, also, the reports have great value. e 
“ Keystone State” is eminently such geologically ; and its survey 
is solving several problems for the country, besides giving us 0% 
best knowledge of its Coal-era vegetation. 
