Sapko, M. J. <br/><br/>
Optical rock dust meter field evaluation / 
by M.J. Sapko, N. Greninger, and H. Perlee. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  1991. 
 - 10 p. :  ill. ;  28 cm. 
 - Report of investigations ;  9385 .
 - Report of investigations (United States. Bureau of Mines) ;  9385. .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>90022807  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine dusts--Measurement.<br/>Optical instruments.<br/>Reflectometer.
<br/><br/><label>LC Class. No.: </label>TN23  TN312  / .U43 no. 9385 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.83 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:9385