blue book
noun
1
                    
                                          
              
          
                                                      : a register especially of socially prominent persons                                      
                
                    
2
                    
                                          
              
          
                                                      : a book of specialized information often published under government auspices                                      
                
                    
3
                    
                                          
              
          
                                                      : a blue-covered booklet used for writing examinations                                      
                
                    
4
                    
                                          
              
          
                                                      : a periodically issued price list (as of used cars)                                      
                
                    
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  Merriam-Webster unabridged




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