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I am looking for municipal-level administrative boundary data (NUTS 5) for Poland. Since it is public information, I thought the data would be readily available, but I can't seem to find it anywhere. I have checked the usual sources. GADM has data down to the county (powiat) level, and Natural Earth seems to only have data down to the provincial level. I have looked at many of the Polish government's sites, but while I can find plenty of GIS data viewers, I can't find a way to download the administrative boundary data I am interested in. To make matters more complicated, I would really like historic data, but I would settle for current NUTS 5 level data.