| Character Positions |   | 
    
      | 18-21 - Undefined (006/01-04) |  | 
    
      | ♯ - Undefined |  | 
    
      | 22 - Target audience (006/05) |  | 
    
      | ♯ - Unknown or unspecified | j - Juvenile | 
    
      | 23 - Form of item (006/06) |  | 
    
      | ♯ - Unknown or unspecified |  | 
    
      | 24-25 - Undefined (006/07-08) |  | 
    
      | ♯ - Undefined |  | 
    
      | 26 - Type of computer file (006/09) |  | 
    
      | a - Numeric data | g - Game | 
    
      | b - Computer program | h - Sound | 
    
      | c - Representational | m - Combination | 
    
      | d - Document | u - Unknown | 
    
      | e - Bibliographic data | z - Other | 
    
      | f - Font |  | 
    
      | 27 - Undefined (006/10) |  | 
    
      | ♯ - Undefined |  | 
    
      | 28 - Government publication (006/11) |  | 
    
      | ♯ - Not a government publication | l - Local | 
    
      | c - Multilocal | m - Multistate | 
    
      | f - Federal/national | s - State, provincial, territorial, dependent, etc. | 
    
      | i - International intergovernmental | z - Other | 
    
      | 29-34 - Undefined (006/12-17) |  | 
    
      | ♯ - Undefined |  |