EBSEES: 4 hits for Western and Northern Territories (Poland)

The European Bibliography of Slavic and East European Studies (EBSEES) collects books, journal articles, reviews and dissertations from Eastern Europe (former countries of Eastern Bloc) which were published in Belgium, Germany, Finland, France, Great Britain, the Netherlands, Austria and Switzerland from 1991 to 2007. The segment "Literature" and "Culture" of the European Bibliography of Slavic and East European Studies contains 18.000 bibliographic entries (from the total asset of 85.000). More information can be found here.

Your search for Western and Northern Territories (Poland) provides 4 hits
1	Bibliographie zur Geschichte Pommerns = Bibliografia historii Pomorza zachodniego Kersken, Norbert Zaborska, Urszula, Marburg, Verl. Herder-Inst., 2002, LII, 294
2	Nachkriegsalltag in Ostpreussen : Erinnerungen von Deutschen, Polen und Ukrainern Münster, Aschendorff, 2004, VII, 526
3	Bibliographie zur Geschichte Ost- und Westpreussens = Bibliografia historii Pomorza Gdanskiego i Prus Wschodnich 1981-1986 Marburg, Verl. Herder-Institut, 2003, pp. CXXVIII, 474
4	"Aussi humainement que possible": le CICR et les minorités allemandes de Pologne et de Tchécoslovaquie (1945-1950) Sans, Anne-Laure, in: Relations internationales 122, 2005, pp. 63-85

The European Bibliography of Slavic and East European Studies (EBSEES) - 1991-2007

Bibliographie zur Geschichte Pommerns = Bibliografia historii Pomorza zachodniego

Nachkriegsalltag in Ostpreussen : Erinnerungen von Deutschen, Polen und Ukrainern

Bibliographie zur Geschichte Ost- und Westpreussens = Bibliografia historii Pomorza Gdanskiego i Prus Wschodnich 1981-1986

"Aussi humainement que possible": le CICR et les minorités allemandes de Pologne et de Tchécoslovaquie (1945-1950)