@misc{Siemiradzki_Józef_(1858–1933)_Płody_[1923],
 author={Siemiradzki, Józef (1858–1933)},
 copyright={Public Domain},
 address={Lwów},
 journal={Wiedza Współczesna},
 howpublished={online},
 year={[1923]},
 publisher={H. Altenberg},
 language={pol},
 title={Płody kopalne Polski},
 type={Text},
 URL={http://www.rcin.org.pl/Content/6768/PDF/Wa51_2097_PAN-11133_r1923_Plody-kopalne-Polski.pdf},
 keywords={mining industry, metallurgical industry, history, Poland},
}