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POFIS SO 1920

SO1-23:

75th anniversary of the issue of the Plebiscite stamps SO 1920. 2/1998, p.40.

Austrian Silesia: events and changes post 1918. 2/1993, p.28; 3/1993, p.67.

Monografie československých známek 5, SO 1920. 2/1999, p.29.

SO28-32:

75th anniversary of the issue of the Plebiscite stamps SO 1920. 2/1998, p.40.

Austrian Silesia: events and changes post 1918. 2/1993, p.28; 3/1993, p.67.

SO33-43:

75th anniversary of the issue of the Plebiscite stamps SO 1920. 2/1998, p.40.

Austrian Silesia: events and changes post 1918. 2/1993, p.28; 3/1993, p.67.