The coal-bearing group in the Nenana Coal Field, Alaska / 
By Clyde Wahrhaftig ... [et al.]. 
 -- Washington :   United States Government Printing Office,   1969 
 - 30 p. -- 
 (Geological Survey Bulletin  ;  1274-D).
<br/><br/> Fecha real de registro 02-06-1969 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Alaska<br/>Carbón
<br/><br/><label>Universal Decimal Class. No.: </label>552.574(798)