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Reconnaissance soil survey of the lower Sewa River floodplain near Torma Bum, Sierra Leone, West Africa / by J.C. Dijkerman, D.H. Westerveld.
- 862.5
- University of Sierra Leone], Njala university college,
- 1969.
- [Freetown :
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Soil survey of the oil palm station and the northwest extension of the Njala university college farm / by J.C. Dijkerman and H. Breteler.
- 862.5
- University of Sierra Leone], Njala university college,
- 1969.
- [Freetown :