@misc{_Karta_1872,
 copyright={Public Domain},
 address={Varšava},
 howpublished={online},
 year={1872},
 publisher={v kartografii Zavedeniâ N. Nipaniča},
 language={rus},
 title={Karta petrokovskoj gubernii},
 keywords={administrative maps, Piotrków Province, Piotrków Trybunalski region, 19th century},
}