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Bydgoszcz Department (Polish: Departament bydgoski) was a unit of administrative division and local government in Polish Duchy of Warsaw in years 1806-1815.
Its capital city was Bydgoszcz.
Following the Decree of 19 December 1807, the area was further divided onto 10 counties (powiats).
References
Bydgoszcz Department Wikipedia(Text) CC BY-SA