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1
by Mertens, Gerhard
Published 1995
Schöningh
Subjects: “...Environmental protection / Study and teaching...”
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2
by Frey, Bruno S.
Published 1992
Vandenhoeck und Ruprecht
Subjects: “...Environmental protection / Economic aspects / Germany (West)...”
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3
by Gumpel, Werner
Published 1985
Selbstverl. d. Südosteuropa-Ges.
Subjects: “...Environmental protection / Congresses...”