1984
EROS Data Center
1:125k
1852
Stansbury, Howard
1:240k
1873
Wheeler, G.M.
1:507k
1879
Powell, John Wesley, 1834-1902.
1:900k
1876
King, Clarence
1:253k
1908
U.S. Geological Survey
1:250k
1952
United States. Air Force
1:500k
