@misc{Hancock_Eugene_Thomas_(1875-?)_Bulletin,
 author={Hancock, Eugene Thomas (1875-?)},
 copyright={Biblioteka Politechniki Gdańskiej},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={czasopismo},
 title={Bulletin 726-A. The new salem lignite field Morton County, North Dakota},
 keywords={geologia, mineralogia, czasopisma, Dakota (Stany Zjednoczone ; stan)},
}