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A soil and irrigability survey of the lower Usutu basin (South) in the Swaziland lowveld : memoir and maps / by G. Murdoch and J.P. Andriesse.
- Her Majesty's Stationery Office,
- 1964.
- London :
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Some aspects of plant succession in the Wady Al A'Azib range station and surrounding areas / by J.P.H. van der Veen.
- 859.6
- s.n.],
- 1964.
- [S.l. :