@misc{Krug_Leopold_(1770-1843)_Die, author={Krug, Leopold (1770-1843)}, address={Berlin}, howpublished={online}, publisher={Verlag von Duncker und Humblot}, language={ger}, type={książka}, title={Die Provinz Ostpreussen. [Bd.] 1-3}, keywords={Prusy Wschodnie, statsytyka}, }