MARC21       008a'23  Form of item
     Values: 
              #   None of the following
              a   Microfilm
              b   Microfiche
              c   Microopaque
              d   Large print
              f   Braille
              g   Punched paper tape [obs.]
              h   Magnetic tape [obs.]
              i   Multimedia [obs.]
              r   Regular print reproduction
              z   Other form of reproduction [obs.]