Zohdy, A. A. R. <br/><br/>
Techniques of water-resources investigations of the United States geological survey 

 - United States  U.S. Department of the Interior 
 - vii,115p.  30cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine subsidence
<br/><br/><label>LC Class. No.: </label>QTO TN319.C3