Emmons, S.F., and Gilbert, G.K., 1893, Excursion to the Canyon of the Colorado. Denver, Colorado, to Flagstaff, Arizona. Itinerary, 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. 464-472.
