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1-620: Płock Land was a land ( administrative division ) of the Kingdom of Poland until 1495, and later, part of the Płock Voivodeship , Crown of the Kingdom of Poland , Polish–Lithuanian Commonwealth , from 1495 to 25 September 1793. The seat of its government was located in Płock . The land was divided into five counties . They were: Sierpc County was formed in the 1530s, from the portion of
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