@misc{Collier_Arthur_James_(1866-1939)_Bulletin,
 author={Collier, Arthur James (1866-1939)},
 howpublished={online},
 publisher={Government Printing Office.},
 language={eng},
 type={czasopismo},
 title={Bulletin 691-K. Coal South of Mancos, Montezuma County, Colorado},
 keywords={geologia, mineralogia, czasopisma, Kolorado (Stany Zjednoczone ; stan)},
}