Appendix F - Format Changes
    
    
      MARC 21 Holdings 
    
      September 2015    
    
    This section is provided for the lists of format changes
    that accompany each update to the MARC 21 Format for
    Holdings Data.
    
    MARC 21 FORMAT FOR HOLDINGS DATA
    FORMAT CHANGE LIST
    
      Update No. 21, September 2015 
    This page documents the changes contained in the twenty-first
      update to the 1999 edition of the MARC 21 Format for
      Holdings Data. Update No. 21 (September 2015)
       includes changes resulting from proposals that were
  considered by the MARC 21 community during June 2015.
 
  
    
	UPDATE 21 CHANGES
    
      ■ New content designators:    
	  
  
      Subfields    
    
      $0 Authority record control number or standard number  (R) in Appendix A -
      
              
      
      Control Subfields    
 
	  
	 
      $0 Authority record control number or standard number   (R) in 337 (Media Type)    
 
      
     
      $0 Authority record control number or standard number   (R) in 338 (Carrier Type)