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Daten zur Umwelt : der Zustand der Umwelt in Deutschland
Daten zur Umwelt : Umweltmonitor ... : für Mensch & Umwelt
(2021)
Environmental and natural resource economics
Tietenberg, Thomas H., (1984)
Research methodology in applied economics : organizing, planning, and conducting economic research
Ethridge, Don E., (1995)
Ethridge, Don E., (2004)
User charges as a means for pollution control : the case of sewer surcharges
Ethridge, Don, (1972)