Riley, W. D. <br/><br/>
Spectral characteristics of grinding sparks used for identification of scrap metals / 
by W.D. Riley, B.W. Dunning, Jr., and D.M. Soboroff. 
 - [Avondale, Md.] :  U.S. Dept. of the Interior, Bureau of Mines,  1985. 
 - 13 p. :  ill. 
 - Report of investigations ;  8932 .
 - Report of investigations (United States. Bureau of Mines) ;  8932. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Scrap metals--Identification.<br/>Spark tests.