Book(print)#11990
Scientists for environmental protection in the Balkans: Ucenye - za cistuju prirodu na Balkanach ; 1st Balkan Scientific Conference on Environmental Protection in the Balkans, September 20-23, 1988, Varna
Vol. 1: Plenary sittings and documents. - 94 S.; Vol. 2: Section proceedings. - 539 S., graph. Darst., Tab