Internationale Conference Bioindicatores Deteriorisationis Regionis (3rd 1977 Liblice, Czechoslovakia)

• Proceedings of the III.rd Internationale Conference Bioindicatores Deteriorisationis Regionis, 12-16th September 1977, Liblice near Prague, Czechoslovakia
• Proceedingsof the 3rd Internationale Conference Bioindicatores Deteriorisationis Regionis, 12-16th September 1977, Liblice near Prague, Czechoslovakia