@misc{Heald_Kenneth_Conrad_(1888-1971)_Bulletin,
 author={Heald, Kenneth Conrad (1888-1971)},
 copyright={Biblioteka Politechniki Gdańskiej},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={czasopismo},
 title={Bulletin 691-C. Geologic structure of the northwestern part of the Pawhuska Quadrangle, Oklahoma},
 keywords={geologia, mineralogia, czasopisma},
}