Czechoslovakia 1930: linguistic.
Czechoslovakia_1930_linguistic_map_-_created_2008-10-30.svg
Czechoslovakia_1930_linguistic_map_-_created_2008-10-30.svg: *derivative work: Henry Mühlpfordt (talk)
Czechoslovakia1930linguistic.jpg: Mariusz Pazdziora
derivative work: Rowanwindwhistler (talk)