Ampian, Sarkis G. <br/><br/>
Crystalline silica overview :  occurence and analysis / 
by Sarkis G. Ampian and Robert L. Virta. 
 - [Washington, D.C.] :  U.S. Dept. of the Interior,  1992. 
 - ii, 27 p. :  ill. 
 - Information circular / Bureau of Mines, U.S. Department of the Interior ;  9317 .
 - Information circular (U.S. Department of the Interior.  9317 .
<br/><br/><label>LCCN: </label>92045200     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Silica.<br/>Silica--Toxicology.<br/>X-rays--Diffraction.