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Africa agricultural animal Appropriate Technology average barefoot doctor bio-gas building capita cent Centre chapter Colombia construction cost course crop described developing countries diseases E. F. Schumacher economic economists electricity equipment example farmer fertiliser figure fuel Futuro Ghana heat Humphrey pump ignition Imperial units important improved income increase India infection initial Intermediate Technology internal combustion engines Kenya Kumasi labour litres low-cost manufacture material mechanical ment methane method National Nigeria operated organisations output overseas P.O. Box particular Photo Peter Fraenkel pipe piston plant pollution population practice problem production programmes protein Reference result rural areas schistosomiasis shows simple skills small industry solar energy solution storage Sudan suitable supply Table tank Tanzania tion traditional units urban vegetation village windmill World Bank Zambia