Johnson, Ross B.  1919- <br/><br/>
Coal resources of the Trinidad coal field in Huerfano and Las Animas counties, Colorado / 
by Ross B. Johnson. 
 -- Washington :   United States Government Printing Office,   1961 
 - P. 130-180 + map. -- 
 (Geological Survey Bulletin  ;  1112-E).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Colorado<br/>Geología
<br/><br/><label>Universal Decimal Class. No.: </label>55(788)