Sources on Jewish Communities in this section:

Brześć Kujawski [Pol], Brisk D'Koya [Yid], Bzhest'-Kuyavski [Rus], Brest-Kujawien [Ger], Brest Kujavsk, Brisk Kuyavsk  

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-495464 JewishGen Locality Page

Dobrzyn  Dobrzyń nad Wisłą [Pol], Dobrin [Yid], Dobrin bei der Veisl [Yid], Dobrin an der Weichsel [Ger], Dobrzyń, Dobryn, Dobrzyń n. Wisłą  

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-499742 JewishGen Locality Page

Kowal [Pol], Koval' [Rus], Kval [Yid], Kovel  

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-510236 JewishGen Locality Page

Lubraniec [Pol], Lubranitz [Yid], Lyubranetz [Rus], Libronetz

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-514467 JewishGen Locality Page

Włocławek [Pol], Vlatzlavek [Yid], Vlotslavek [Rus], Vladislavia [Lat], Leslau [Ger, 1940-45], Alt Lesle, Votslavsk

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-535957 JewishGen Locality Page

http://www.jewishgen.org/Yizkor/Wloclawek/Wloclawek.html Yizkor Book

http://www.jewishgen.org/Yizkor/Wloclawek1/Wloclawek1.html Yizkor Book