@misc{Heald_Kenneth_Conrad_(1888-1971)_Bulletin,
 author={Heald, Kenneth Conrad (1888-1971) and Mather, Kirtley Fletcher (1888-1978)},
 copyright={Gdańsk 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},
}