Cottrell, K. W. <br/><br/>
Peat in 1922 :   Mineral resources of the United States, 1922-Part II. 

 - Washington, D. C.   Goternment printing office  1923 
 - pp. 5-6 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Index Terms: </label>MINERALES MINERIA TURBA