Page 25 of 29	
  Wood GH, Kehn TM, Devereux Carter, M and Culbertson WC (1983) Coal resource classification system of the U.S. Geological Survey. Geological Survey Circular 891, United States Geological Survey, Denver. Viewed 4 August 2014, http://www.pubs.usgs.gov/circ/c891/.
	  	
	  	  				  	
	    
	    					Last updated: 				    
	    
	  	  	
	  	
	  
		            
	    8 January 2018	  
	
	  	
	  	 
						
			  		
	    					Summary and download				    
	    
	  	  	
	  	
	  
	
	  	
	  	Product Finalisation date
	    					2015						
			  		
    
  
	    					PRODUCT CONTENTS				    
	    
	  	  	
	  	
	  
	
	  	
	  	ASSESSMENT
	    					ASSESSMENT COMPONENT				    
	    
	  	  	
	  	
	  
	
	  	
	  	