REMOVE

1. Diagram
2. Atlas Map
3. Water

WHAT

1. Data Visualization (2)
2. Coal (1)

WHERE

1. Europe (1)
2. Switzerland (1)

WHO

1. Bibliographisches Institu … (1)
2. Eidgenössische Landestopo … (1)
3. Gutersohn, Heinrich, 1899 … (1)
4. Imhof, Eduard, 1895-1986 (1)
5. Kasser, Peter (1)

WHEN

1. 1930 (1)
2. 1967 (1)
3. 1978 (1)