Stevenson, John James. <br/><br/>
Report of progress in the Fayette & Westmoveland district of the bituminous coald-fields of western Pennsylvania /  
by J. J. Stevenson. 
 - Harrisburg :   The board of Commissioners,   1877-1878. 
 - 2 v. ;   23 cm. 
 - Second Geological Survey of Pennsylvania .
 - Second Geological Survey of Pennsylvania .
<br/><br/>Contiene : Part I. Eastern Allegheny County and Fayette and Westmoreland Countles west from Chestnut Ridge -- Part II. The ligonier Valley 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología---Pennsylvania.