@misc{Hopkins_Oliver_Baker_Bulletin,
 author={Hopkins, Oliver Baker and Powers, Sidney (1890-1932)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 686-S. Structure and oil and gas resources of the Osage Reservation, Oklahoma. T. 24 N., RS. 11 and 12 E},
 keywords={geology, mineralogy, United States of America, journals},
}