@misc{Heald_Kenneth_Conrad_(1888-1971)_Bulletin, author={Heald, Kenneth Conrad (1888-1971)}, copyright={GdaƄsk University of Technology Library}, howpublished={online}, publisher={Government Printing Office.}, language={eng}, type={journal}, title={Bulletin 686-E. Structure and oil and gas resources of the Osage Reservation, Oklahoma. T. 25 N., R. 9 E}, keywords={geology, mineralogy, petroleum, United States of America, journals}, }