Heinrich, E. William  1918- <br/><br/>
Deposits of the sillimanite group of minerals south of Ennis, Madison County,  with notes on other occurrences in Montana. 

 - Butte,  Montana School of Mines,  1948. 
 - iii, 22 p.  illus., plate,  28 cm. 
 - Montana. Bureau of Mines and Geology. Miscellaneous contribution  no. 10 .
 - Montana Bureau of Mines and Geology.  Miscellaneous contribution ;  no. 10. .
<br/><br/>"References": p. 21-22. 
<br/><br/><label>LCCN: </label>gs 48000080  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sillimanite.<br/>Mines and mineral resources--Montana--Madison County.
<br/><br/><label>LC Class. No.: </label>QE391.S5  / H4