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2
-
The Netherlands participation at the New York world's fair 1939 / [ed. by H. Rosse].
- Waltman,
- 1939.
- Delft :
-
Evenwichtsverstoringen in De Aarde / Prof. Dr. Ir. F. A. Vening Meinesz.
- Waltman,
- 1939.
- Delft :