Smith, Phyllis. <br/><br/>
Once a coal miner :  the story of Colorado's northern coal field / 
by Phyllis Smith. 
 - Boulder, Colo. :  Pruett,  c1989. 
 - 249 p. :  ill. 
<br/><br/> Maps on lining papers. 
<br/><br/><label>ISBN: </label>087108774X 
<br/><br/><label>LCCN: </label>92023039 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal miners--History.--Colorado<br/>Coal mines and mining--History.--Colorado