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Vegetation, Landnutzung und Agrarpotential in El Salvador (Zentralamerika)
Lauer, Wilhelm, (1956)
The problem of land fragmentation in the mediterranean area: a case study
Shaw, D. J., (1963)
The measurement of land resources : address delivered at the 18th International Geographical Congress, Rio de Janeiro, Aug. 1956
Stamp, L. Dudley, (1958)
The Volta dam: its prospects and problems
Steel, Robert W., (1968)
Geography and the developing world
Steel, Robert W., (1967)
The non-African populations of British Central and East Africa
Steel, Robert W., (1962)