References for this description (or part of this) or for the depiction in the file are not provided.
Reason: – Wikipedia is not a reliable source. The alleged data from Wikipedia article Polish census of 1931(above) is insufficient. Sample comparison with File:Woj.poleskie-Polska spis powszechny 1931.pdf (pp. 56-58) reveals that percentage points for individual counties illustrated here do not match the actual results of 1931 survey. Example can be drawn from the analysis of File:Województwo poleskie - podział administracyjny 1939.png. Yellow colour in this map marks Powiat Kobryn (westside in Poleskie, see the source data: Jewish: 8,697+1,792 (10,489); Ukrainian: 21,934; Polish: 10,040; Belarusian: 5,208; Russian: 3,373. Total is 41,004 including Polish at 24.5% ... Polish is NOT "less than 10%", it is 24.5%. In this map, "local" is being interpreted as "non-Polish" while "local" in the actual census meant all of the above ("local" was 62,854). Poeticbenttalk 16:13, 8 October 2016 (UTC).
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