Grummitt, W.E. <br/><br/>
Recent developments in low background geiger-müller counters. 

 - Chalk River :  AECL,  1956. 
 - v. 34 p. 206-213 
<br/><br/><label>ISSN: </label>0067-0367 
<br/><br/><label>Standard No.: </label>AECL-274