MARC21       007s'06  Dimensions
     Values: 
             Open   reels and discs
              a   3 in.
              b   5 in.
              c   7 in.
              d   10 in.
              e   12 in.
              f   16 in.
              g   4 3/4 in. or 12 cm.
                  Cassette
              j   3 7/8 x 2 1/2 in.
                  Cartridge
              o   5 1/4 x 3 7/8 in.
                  Cylinder
              n   Not applicable
              s   2 3/4 x 4 in.
              u   Unknown
              z   Other