Acoustic emission/microseismic activity in geologic structures and materials proceedings of the fourth conference held at the Pennsylavania State University,october 22-24,1985 
edited by H. Reginald Hardy,Jr. 
 - Clausthal-Zellerfeld, Germany :  Trans Tech Publications,  1989 
 - 711 p.  :  ill. ;  23 cm. 
 - Series on rock and soil mechanics ; v. 17 .
<br/><br/>Include bibliographies and indexes 
<br/><br/><label>ISBN: </label>0878490817 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acoustic emission--Congresses<br/>Microseisms--Congresses<br/>Geology