@misc{Heald_Kenneth_Conrad_(1888-1971)_Bulletin, author={Heald, Kenneth Conrad (1888-1971) and Mather, Kirtley Fletcher (1888-1978)}, copyright={GdaƄsk University of Technology Library}, howpublished={online}, publisher={Government Printing Office.}, language={eng}, type={journal}, title={Bulletin 686-R. Structure and oil and gas resources of the Osage Reservation, Oklahoma. T. 26 N., R. 8 E}, keywords={geology, mineralogy, United States of America, journals}, }