@misc{_Mineral,
 copyright={Biblioteka Politechniki Gdańskiej},
 howpublished={online},
 publisher={United States Geological Survey},
 language={eng},
 title={Mineral Resources of the United States 1913 Part 2: 17-18, 20-35},
 type={czasopismo},
 keywords={Mineralogia, czasopisma},
}