Sources on Jewish Communities in this section:

Brok  Brok [Pol, Yid, Rus]

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-495197 JewishGen Locality Page

Kosow Lacki  Kosów Lacki [Pol], Kosov Latski [Yid], Kosuv-Liatzki [Rus], Koseve, Kosov Lacki, Kossów Lacki, Kossów, Kosów, Kosov

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-510039 JewishGen Locality Page

http://www.jewishgen.org/Yizkor/pinkas_poland/pol7_00474.html Yizkor Book

Nur  Nur [Pol, Rus, Yid]

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-519177 JewishGen Locality Page

Szterdyn  Sterdyń [Pol], Sterdin [Yid], Sterdyń-Osada, Esterdin

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-530322 JewishGen Locality Page

Sztotschek  Stoczek [Pol], Stok [Yid], Stochek [Rus], Stoczek-Węgrowski, Stochek Vengrovski, Stok bai Vengrov, Stoczek (near Łochów)

http://data.jewishgen.org/wconnect/wc.dll?jg~jgsys~community~-530375 JewishGen Locality Page