Strickland, W. H. <br/><br/>
Characteristics of ultrasonic ranging sensors in an underground environment / 
by W.H. Strickland and R.H. King. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  19932. 
 - ii, 39 p. :  ill. ;  28 cm. 
 - Report of investigations ;  9452 .
 - Report of investigations (United States. Bureau of Mines) ;  9452. .
<br/><br/>Includes bibliographical references (p. 35-36). 
<br/><br/><label>LCCN: </label>92026918  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining machinery--Automatic control.<br/>Sonar.
<br/><br/><label>LC Class. No.: </label>TN23  TN345  / .U43 no. 9452 
<br/><br/><label>Dewey Class. No.: </label>622