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Studies on the microbiological retting process for the preparation of a hard fiber, and influence of this process on the fiber properties / by A.N.J. Heyn.
- North-Holland,
- 1951.
- Amsterdam :
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Education in Suriname (Dutch Guiana) and the linguistic situation / by W.Gs. Hellinga ; in cooperation with the Department of cultural and physical anthropology of the Royal tropical institute.
- Koninklijk Instituut voor de Tropen,
- 1951.
- Amsterdam :