REMOVE

1. Kuhn, E.
2. Koffmahn, O.
3. Kern
4. Berghaus

WHAT

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

WHERE

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

WHO

1. Gamble, W.H. (1)
2. Mitchell, Samuel Augustus … (1)
3. S.A. Mitchell Jr. (1)
4. U.S.C.S. Dept. (1)
5. Williams, W. (1)

WHEN

1. 1874 (1)