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Programme [of the] fourth International congress of soil science, Amsterdam, July 24 - August 1, 1950
- [s.n.],
- 1950.
- Amsterdam :
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Report on the 32nd international congress of Americanists at Copenhagen, August 8th-14th 1956 / by H. Feriz.
- 87
- [s.n.],
- 1956.
- Amsterdam :