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3
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In search of metals : public lecture / delivered by Sietze Dijkstra.
- Waltman,
- 1968.
- Delft :
-
Geomorphology and environment : inaugural address / delivered by Herman Th. Verstappen.
- Waltman,
- 1968.
- Delft :
-
The changing art of geological surveying : inaugural address / delivered by Caesar Voûte.
- Waltman,
- 1968.
- Delft :