Campbell, Marius R.  1858-1940. <br/><br/>
The twentymile park district of the Yamps coal field, Routt county, Colorado, 
by Marius R. Campbell. 
 - Washington,  Govt. Print. Off.,  1923. 
 - iv, 82 p. XIII pl.  (part. fold.; incl. map. diagrs.) tables, diagrs.  23 cm. 
 - U.S.  Geological survey.  Bulletin 748 .
<br/><br/> At head of title: Department of the Interior.  Map folded in pocket. 
<br/><br/><label>LCCN: </label>gs 23000261  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal--Colorado--Routt County.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 748