1. Soils and geomorphology;Birkeland,1984
2. Hydrometer method improved for making particle-size analyses of soils;Bouyoucos;Agron. J.,1962
3. Soluble salts;Bower,1965
4. The ecology of the Alpine Zone of Mount Kenya;Coe,1967
5. Pollen analytical studies in East and Southern Africa;Coetzee,1967