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Relations between the constants of wood oil / by E.D.G. Frahm and D.R. Koolhaas.
- Centen,
- 1938.
- Amsterdam :
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The spectrographic determination of the elements according to arc methods in the range 3600-5000 A. ; On the occurrence of rarer elements in the Netherlands East Indies / by W. van Tongeren.
- Centen,
- 1938.
- Amsterdam :