Mason, Ralph S. <br/><br/>
Coal resources of Oregon, 
by Ralph S. Mason and Margaret I. Erwin. Prepared in cooperation with the Oregon Dept. of Geology and Mineral Industries. 
 - Washington,  1955. 
 - ii, 7 p.  maps (part fold.)  27 cm. 
<br/><br/>Bibliography: p. 6-7. 
<br/><br/><label>LCCN: </label>gs 55000283  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining--Oregon.
<br/><br/><label>LC Class. No.: </label>QE75  / .C5 no. 362 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.4/2:362