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EAST AFRICAN GEOGRAPHICAL REVIEW
TREND SURFACE MODELS
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acreage activities Africa agricultural analysis annual areal areas associated barchans building Central centres changes cities cluster component construction cotton crops defined direction disease distance distribution district dunes East Eastern economic effect environmental equation estimated expected factors Figure flows functional Geographical given Government housing important increase industry infection influence interaction Kano Kano Plains Kenya land major matrix measured median rainfall method migration mobility movement Nigeria northern observed onchocerciasis patterns periods planning polynomial population possible present problems producer rainfall range region relatively Report require residuals river rural sand schemes season settlement shows significant simulium Source spatial stations structure Sudan Sugar Belt Table Tanzania trend surface Uganda urban valley variable variations vector West Western winds