REMOVE

1. Wyoming
2. U.S.C.S. Dept.
3. S.A. Mitchell Jr.

WHAT

1. Atlas Map (1)
2. World Atlas (1)

WHERE

1. Colorado (1)
2. Montana (1)
3. North Dakota (1)
4. South Dakota (1)

WHO

1. Gamble, W.H. (1)
2. Mitchell, Samuel Augustus … (1)
3. Williams, W. (1)

WHEN

1. 1874 (1)