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Research and development : a prerequisite for economic progress in industry / D.L. Bosman.
- Council for scientific and industrial research. Timber research unit,
- 1969.
- Pretoria :
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Solar drying of timber : a development study / C.H. Banks ; with an appendix by L.J. Heyl on estimating the economics of the process.
- 865.1
- Council for scientific and industrial research. Timber research unit,
- 1969.
- Pretoria :