Sources on Jewish Communities in this section:

Blaszki (c)

http://www.sztetl.org.pl/en/city/blaszki/ The Virtual Shtetl

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  (c,s)

http://www.sztetl.org.pl/en/city/sieradz/ The Virtual Shtetl

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 *

http://www.sztetl.org.pl/en/city/warta/ The Virtual Shtetl

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

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