Envirotech Vienna 1989 : first international ISEP congress : chemicals - technologies - hazardous waste : first announcement, call for papers : Vienna/Hofburg, Austria, February 20-22, 1989.
International Society for Environmental Protection.
Internationale Gesellschaft für Umweltschutz.
[S.l. : s.n.,
1988?]
At foot of title page: ISEP, I.G.U.