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Threshold level 1990 / by J.A. van Ek and J.L.M. Trim.
- 428.0071 E366
- Ek, Jan Ate van.
- Council of Europe Press,
- 1991 [reprinted 1993].
- [Strasbourg] :
-
Waystage 1990 / by J.A. van Ek and J.L.M. Trim.
- 407.094 E366 1991
- Ek, Jan Ate van.
- Council of Europe Pub.,
- c1991.
- Strasbourg :