Frech, F., 1893, Section in Congress Canyon opposite Point Sublime, in Emmons, S.F., ed., Geological guide book of the Rocky Mountain excursion: Congres Geologique International, Compte Rendu de la 5me Session Washington, 1891: Washington, Imprimerie du Gouvernement [U.S. Government Printing Office], Part 4B, p. 476-481.
