MARC21       008s'20  ISSN center
     Values: 
              #   No ISSN center code assigned
              0   International Center
              1   United States
              2   United Kingdom [obs.]
              3   Australia [obs.]
              4   Canada
              5   Moscow Regional Centre [obs.]
              6   Federal Republic of Germany [obs.]
              7   France [obs.]
              8   Argentina [obs.]
              9   Japan [obs.]
              u   Unknown [obs.]
              z   Other