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The D?browa Basin is a socio-economic region established in the 19th century. It is located in southern Poland. The time periods cover the years 1975-1989. The initial date is 1975 - under the act of the Sejm [lower chamber of the Polish parliament] of the People's Republic of Poland of 28 May 1975 on the national administrative reform, 49 provinces were established in place of the then 17 ones. In turn, the closing date is marked by 1989 - the beginning of the political transformation in Poland. A basic research ...