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Der Pflug als Kultgerät / Jannis C. Notebaart.
- s.n.,
- 1955].
- [Düsseldorf :
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Potash response in "supposed" unresponsive soils determined by a new technique of experiments on cultivators' fields / H.N. Mukerjee.
- s.n.,
- 1955].
- [S.l. :
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Inleiding by die tentoonstelling van Afrikaanse boeke / [C.M. van den Heever].
- s.n.,
- 1955].
- [Johannesburg :