Sources on Jewish Communities in this section:

Błaszki [Pol], Blashka [Yid], Blashki [Rus]  

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-493961 JewishGen Locality Page

http://www.jewishgen.org/Yizkor/pinkas_poland/pol1_00069.html Yizkor Book

Sieradz [Pol], Sheradz [Yid], Seradz [Rus], Schieratz [Ger], Sheredz, Shiradz

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-527905 JewishGen Locality Page

http://www.jewishgen.org/Yizkor/pinkas_poland/pol1_00263.html Yizkor Book

http://www.jewishvirtuallibrary.org/jsource/judaica/ejud_0002_0018_0_18480.html History

Warta [Pol], Dvart [Yid], Varta [Rus], Liebwart [Ger], Dvurt  

http://www.jewishgen.org/Yizkor/warta/warta.html JewishGen Locality Page

http://www.jewishgen.org/Yizkor/pinkas_poland/pol1_00089.html Yizkor Book