@misc{Hopkins_Oliver_Baker_Bulletin, author={Hopkins, Oliver Baker and Powers, Sidney (1890-1932)}, copyright={GdaƄsk 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}, }