@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 691-D. Geology and oil and gas prospects of the Lake Basin Field, Montana},
 keywords={geologia, mineralogia, czasopisma, Montana (Stany Zjednoczone ; stan)},
}