Kuścin-Mikołajówka — summer resort in sokólski powiat Białystok Voivodeship of Polish Republic (Second Rzeczpospolita, 1920-1939).
Information presented on the Radzima.net: 
Catholic parish to which the summer resort Kuścin-Mikołajówka belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
Administrative affiliation of the summer resort Kuścin-Mikołajówka
— the administrative-territorial units to which the settlement belonged in different historical periods:— Polish Republic (Second Rzeczpospolita, 1920-1939), Catholic parish to which the summer resort Kuścin-Mikołajówka belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
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