REMOVE

1. Atlas Map
2. Data Visualization
3. Topography
4. National Atlas
5. 1973

WHAT

1. Glaciers (1)
2. Historical (1)

WHERE

1. Switzerland (1)
2. Valais Alps (Switzerland) (1)
3. Valais Region (Switzerlan … (1)

WHO

1. Eidgenössische Landestopo … (1)
2. Imhof, Eduard, 1895-1986 (1)
3. Verlag der Eidgenössisch … (1)

WHEN

1. 1978 (1)