Tysdal, Russell G. <br/><br/>
Revision of Middle Proterozic Yellowjacket Formation, central Idaho, and Revision of Cretaceous Slim Sam Formation, Elkhorn Mountains area, Montana / 
by R. G. Tysdal. 
 - Washington, D. C. :  Denver, CO :  U. S. G. P. O. ;  For sale by U.S. Geological Survey, Information Services  2000. 
<br/><br/><label>ISBN: </label>0607895543 (pbk.) 
<br/><br/><label>Subjects--Index Terms: </label>გეოლოგია