@misc{Darton_N._H._(1865-1948)_Bulletin,
 author={Darton, N. H. (1865-1948) and Darton, Nelson Horatio (1865-1948)},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 title={Bulletin 691-A. The structure of parts of the Central Great Plains},
 type={czasopismo},
 keywords={geologia, mineralogia, czasopisma},
}