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This publication in Polish ("Polityka Narodowa" - "Nation's Politics" monthly, No. 4-6 April-June 1939) has article "Regiony polskie w Niemczech" ("Polish regions in Germany") by Jędrzej Giertych. It describes areas of Germany with Polish minority and territorial claims of Poland in case of war (which was already anticipated at that time):
https://jbc.bj.uj.edu.pl/Content/360...39_004_005.pdf
It generally mentions the same areas of Germany that Dmowski wanted for Poland in 1919 (see Dmowski's Line), including western and southern parts of East Prussia. North-eastern part of East Prussia was to be given to Lithuania. North-central part of East Prussia - with Konigsberg - was to become a separate "Free State Prussia".
Dmowski's Line, western part:
http://translate.google.com/translat...zachodnie.html
http://www.ibidem.com.pl/zrodla/1918...zachodnie.html
https://www.youtube.com/watch?v=CiARxZ75O4o
Already Dmowski suggested back in 1919 - to create a rump East Prussian state (not as one of provinces of Weimar Germany, but as a separate state, just like Austria) under the protection of the League of Nations, with Konigsberg as the capital city, and in a customs union with Poland. So the international status of such East Prussian state would be similar to that which Free City Danzig had in reality.
That's why I called it "Free State (East) Prussia" above.
As for the Oder-Neisse Line as post-war Polish border:
National Democracy (Narodowa Demokracja) was the first political faction which embraced that idea - they supported the Oder-Neisse Line (or actually even more westerly border, because they also wanted to annex Vorpommern, Rugen, Lebus region and Lusatia) since the Summer of 1941.
Polish People's Party also embraced the Oder-Neisse in 1941.
Polish Socialists supported the Oder-Neisse since late 1942.
Centre-Left expressed support for the Oder-Neisse in 1943.
Support for the Oder-Neisse (Old Piast Border) was increasing as people were becoming more and more outraged by the brutality of German atrocities and also as Stalin and the Western Allies supported it. Since 1943 all the major Polish political factions supported this proposal as post-WW2 borders. Of course, they also expected that territorial losses in the East were going to be smaller than in reality.
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