@misc{Heald_Kenneth_Conrad_(1888-1971)_Bulletin,
 author={Heald, Kenneth Conrad (1888-1971)},
 copyright={Gdańsk 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},
}