@misc{Burchard_Ernest_F._(1875-1961)_Bulletin,
 author={Burchard, Ernest F. (1875-1961) and Burchard, Ernest F. (1875-1961)},
 copyright={Gdańsk University of Technology Library},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={journal},
 title={Bulletin 821-C. Iron ore on Canyon Creek Fort Apache Indian Reservation, Arizona},
 keywords={cartography, geology, iron, mineralogy, United States of America, journals},
}