@misc{Hopkins_Oliver_Baker_Bulletin,
 author={Hopkins, Oliver Baker},
 copyright={Biblioteka Politechniki Gdańskiej},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={czasopismo},
 title={Bulletin 686-H. Structure and oil and gas resources of the Osage Reservation, Oklahoma. T. 25 N., RS 11 and 12 E},
 keywords={geologia, mineralogia, ropa naftowa, czasopisma, Oklahoma (Stany Zjednoczone ; stan)},
}