MARC21       007s'03  Speed
     Values: 
             Discs
             a   16 rpm
              a   16 rpm
              b   33 1/3 rpm
              c   45 rpm
              d   78 rpm
              e   8 rpm
              f   1.4 m. per sec.
                  Cylinders
              h   120 rpm
              i   160 rpm
                  Tapes
              k   15/16 ips
              l   1 7/8 ips
              m   3 3/4 ips
              o   7 1/2 ips
              p   15 ips
              r   30 ips
              u   Unknown
              z   Other