REMOVE

1. Colombia
2. South America
3. S.A. Mitchell, Jr.

WHAT

1. Atlas Map (2)
2. State Atlas (2)
3. World Atlas (2)
4. Canals (1)

WHERE

1. Atrato River Region (Colo … (1)
2. Guiana (1)
3. Panama (1)

WHO

1. Campbell, R.A. (2)
2. Mitchell, Samuel Augustus (2)
3. R.A. Campbell (2)
4. Walling, H. F. (2)

WHEN

1. 1870 (2)