Strickland, W. H. <br/><br/>
Characteristics of ultrasonic ranging sensors in an underground environment / 
by W.H. Strickland and R.H. King. 
 - Washington, DC :  U.S. Dept. of the Interior, Bureau of Mines,  1992. 
 - ii, 39 p. :  ill. 
 - Report of investigations ;  9452 .
 - United States.  Bureau of Mines.  Report of investigations ;  9452. .
 - Report of investigations (United States. Bureau of Mines) ;  9452. .
<br/><br/><label>LCCN: </label>92026918  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining machinery--Automatic control.<br/>Sonar.