Czechoslovakia 1930: linguistic
Mariusz Paździora
CC BY 3.0
<p><span class="int-own-work" lang="en">Own work</span>
</p><p>The map is based on the following sources:<br></p>
<ul><li>Czechoslovak geographical atlas (1936) map called: Republika Ceskoslovenska. Pomery narodnostni.<br></li>
<li>Polish Geographical Atlas (Powszechny atlas geograficzny), Lwów 1928, map 48.<br></li>
<li>Polish historical atlas (Atlas historyczny świata), Warsaw 1974, p. 120.<br></li>
<li>German historical atlas Westermann Grosser Atlas zur Weltgeschichte, Brunswick 1956, p. 151.<br></li>
<li>German Historischer Atlas, Berlin 1997, p. 99.<br></li></ul>