1
Umweltgutachten . 1994
Book
1994
2
Umweltlexikon.
Book
1993
3
Umweltqualitätsziele, natürliche Variabilität, Grenzwerte : Geotechnica 1995: Beiträge : 01.05.95-02.05.95.
Book
4
Institutions for the earth: sources of effective international environmental protection.
Book
5
Companion encyclopedia of geography: the environment and humankind.
Book
6
World in transition : ways towards global environmental solutions.
Book
1996