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											Climate Change Research ?? 2011, Vol. 7  ?? Issue (3): 233-234.									
      
                
      
					                
      
				
      
										
													
								 
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					Dark Ages Cold Period	   
				
      
								
      
					
												  
						
						
						
					
				
          
				
				
      
					
      
						 
        
													
      
					
      
					 
        
						
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																	Received:2010-09-26
															
							
																	Revised:2011-01-13
															
							
															
							
																	Online:2011-05-30
															
							
																	Published:2011-05-31
															
						
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京ICP備11008704號-4
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