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DEESDiplôme d'Etat d'Educateur Spécialisé (French: State Diploma of Specialist Educator; professional certification)
DEESDivision of Earth and Ecosystem Sciences (est. 1999; Desert Research Institute; Nevada)
DEESDomestic Energy Efficiency Scheme (Ireland)
DEESDynamic Electromagnetic Environment Simulator
DEESDepartment of Environmental and Engineering Services (Florida)
DEESDepartment of Engineering and Environmental Services