@misc{Mazur_Tadeusz_(historia)_The,
 author={Mazur, Tadeusz (historia)},
 howpublished={online},
 publisher={Wydawnictwo UMCS},
 language={eng},
 type={artykuł},
 title={The level of births and deaths in the Lublin province in 1867-1912},
 keywords={demografia, urodzenia, zgony, gubernia lubelska, 1867-1912},
}