Durkin, John <br/><br/>
Evaluation of the seismic system for locating of trapped miners / 
by John Durkin and Roy Greenfield 
 - Bureau of Mines, Washington :  U.S. Dept. of the Interior,  1981 
 - 55 p. ;  27 cm. 
 - Report of investigations / Bureau of Mines .
<br/><br/><label>LCCN: </label>81-2170 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine rescue work--Equipment and supplies<br/>Seismometers