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Schleswig Plebiscites 2024 Plebiscites in post-Versailles Europe - Articles - Institute of National Remembrance Instytut Pamięci Narodowej
The post-World War I Schleswig plebiscite and the stamps that honored it, explained Linn's Stamp News
A film about plebiscites in Upper Silesia and Schleswig - Poland in Denmark Gov.pl
Germany, Denmark celebrate border centennial DW (English)