Current refinement(s):

Soil Degradation. Proceedings of the Land Use Seminar on Soil Degradation, Wageningen 13-15 October 1980. [Monograph]
Boels, D. \ Davies, D.B. \ Johnston, A.E. \ 1982
erosion - soil conservation - soil degradation - soil management - soil organic matter - Europe - UK - Netherlands - Ireland - Italy - Germany - France - Denmark - Ireland
Classification in Geography. Concepts and Techniques in Modern Geography No. 6. [Monograph]
Johnston, R.J. \ 1976
geography - geomorphology - landforms
Eastern Africa Country Profiles, Country Profile #4 : The Republic of Somalia. Revised Edition [Monograph]
Berry, L. \ Johnston, I. \ 1983
irrigation - land use - water - Somalia
Proceedings of Workshop C Organized by the International Potash Institute at the 16th World Congress of Soil Science, Montpellier, France, 20-26 August 1998. Essential Role of Potassium in Diverse Cropping Systems. [Monograph]
Johnston, A.E. \ 1999
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