REMOVE

1. Russia
2. Sweden
3. Berghaus
4. 1880

WHAT

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

WHERE

1. Norway (2)
2. Caucasus (1)
3. Finland (1)

WHO

1. Eberhardt, H. (2)
2. Justus Perthus (2)
3. Kuhn, E. (2)
4. Petermann, A. (2)

WHEN

1. 1881 (2)