Marr, Harold E. <br/><br/>
XRF4-computer programing for X-ray analysis / 
by Harold E. Marr, III. 
 - [Washington] :  U.S. Dept. of the Interior, Bureau of Mines,  1976. 
 - [3], 32 p. 
 - Information circular ;  8712 .
 - United States.  Bureau of Mines.  Information circular ;  8712. .
 - Information circular (United States. Bureau of Mines) ;  8712 .
<br/><br/> Item 637-A 
<br/><br/><label>LCCN: </label>91055151     
<br/><br/><label>Subjects--Topical Terms: </label><br/>X-rays--Computer programs.