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(1990). Thermophilic Campylobacters in two sewage treatment plants in Libya.
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(1991). Agri-environmental policy in the U.S. and EC: The effect of fertilizer policies on production and trade of wheat and corn.
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(1991). An alga-like organism associated with an outbreak of prolonged diarrhea among foreigners in Nepal.
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(1991). Community financing: the urban health card in Chiangmai, Thailand.
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