Wardle, W. <br/><br/>
A comprehensive references book on practical coal mining / 
W. Wardle 
 - 4th ed. 
 - London :  The Colliery Guardian Company Limited,  [1891] 
 - 2 p.l., iv, 600 p. :  ill. fold plates. ;  20 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering Geology<br/>Geophysics<br/>Mining engineering
<br/><br/><label>Dewey Class. No.: </label>131