Ostrówek — folwark in Kosów powiat Polesie Voivodeship of Polish Republic (Second Rzeczpospolita, 1920-1939).
Information presented on the Radzima.net: 
Orthodox parish to which the folwark Ostrówek belonged at the beginning of the 20th century;
metrical books of the Orthodox parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
links to microfilms of church records (births, christenings, marriages, deaths);
Location of the folwark Ostrówek
— geographic coordinates and depiction of the folwark Ostrówek on early-20th-century detailed maps, modern maps, and satellite imagery (Google Maps). Administrative affiliation of the folwark Ostrówek
— the administrative-territorial units to which the settlement belonged in different historical periods:— Russian Empire (1870-1910s), — Polish Republic (Second Rzeczpospolita, 1920-1939), Orthodox parish to which the folwark Ostrówek belonged at the beginning of the 20th century;
metrical books of the Orthodox parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
links to microfilms of church records (births, christenings, marriages, deaths);
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Dear Adam,
Polish ministry of information & Documentation archive.
Teodor and Segiusz Siemaszko arrested by the NKVD.
There name's are mentioned here:
http://szukajwarchiwach.pl/800/41/0/-/217/skan/full/5tNnKMWas3xzNSKx33SoUQ
.. . and here.. .
http://szukajwarchiwach.pl/800/41/0/-/219/skan/full/daMOBoyx2D6184BTQl7jAQ
Boleslaw Kaczorowski, also arrested with them, was the Gajowy.
My own family was from Ostrowek.. . Archangielsk.. . Iran.. .. England.
Best regards, Mark Ostrowskireply
Moja rodzina pochodzi z tych samych stron a dokladnie z majatku Obrowo. Majtek tez zostal przez cara zabrany i oddany carskiemu generalowi. Czy wie Pan moze o jakims pokrewienstwie? Z calej rodziny mego ojca zostalo tylko jego rodzenstwo. Moj pradziadek Jozef Siemaszko mial braci stryjecznych Jacka Antoniego Karola oraz Jerzego Napoleona i braci rodzonych Karola Jakuba i Aleksandra i Wincentego. Mam drzewo genealogiczne potwierdzone Szlacheckie Zgromadzenie Minskiej Guberni z 14. 07. 1859 r.
Pozdrawiam i prosze o okontakt.
Szukam Antoniego Stawowskiego ewentualnie Henryka jego syna którzy kiedyś mieszkali w folwark Ostrówekreply
2013-10-20 Adam Drobiazgiewicz