Johnson, Ross B.,  1919- <br/><br/>
Geology of the igneous rocks of the Spanish Peaks region, Colorado, 
by Ross B. Johnson 
 - Washington :  United States Government Printing Office,  1968 
 - vi, 47 p. :  ill., fold. col. map (in pocket) ;  29 cm. 
 - Geological Survey professional paper 594-G Shorter contributions to general geology .
<br/><br/>Bibliography: p. 37-38 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rocks, Igneous<br/>Petrology--Colorado--Spanish Peaks region<br/>Geology--Colorado--Spanish Peaks region
<br/><br/><label>Dewey Class. No.: </label>550.8