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german appropriate technology exchange
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View U.S. national processing center for GATE By United States. Environmental Data Service. Center for Experiment Design and Data Analysis. 
U.S. national processing center for GATE
By United States. Environmental Data Service. Center for Experiment Design and Data Analysis.
View U.S. national processing center for GATE By Ward R. Seguin 
U.S. national processing center for GATE
By Ward R. Seguin