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Enviornment
Günther, Edeltraud, (2007)
Umwelt
Die Fokusgruppen-Methode alsInstrument in der Umwelt- undNachhaltigkeitsforschung
Henseling, Christine, (2006)
Conceptual frameworks for natural resource information systems
Friend, Tony, (1981)
International experience in the development of environmental statistics
Friend, Tony, (1978)