Title: Cleaving an unknown world
Subjects: Correspondence, Sources, Description and travel, Diaries, Scientific expeditions, History, Discovery and exploration, Powell, john wesley, 1834-1902, Colorado plateau, America, discovery and exploration, Southwest, new, description and travel
Places: Colorado Plateau, New Southwest
People: John Colton Sumner, John Wesley Powell (1834-1902), Frederick Samuel Dellenbaugh (1853-1935), Francis Marion Bishop (1843-1933), John K. Hillers (1843-1925)
Time periods: 19th century