Figure 3a. Historical lake level curves for a closed-basin lake, Turkana. Note difference in the scales on the graphs (from Hopson, 1982, and Butzer 1971).



Figure 3b. Historical lake level curves for an open-basin lake, Lake Victoria (top), and Lake Malawi wich was closed between 1915 and 1935. Note the difference in the scales on the graphs (from Beadle, 1981)

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