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.