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- [34] STUDIES ON AIR-POLLUTANTS IN GRAZ AREA .6. INVESTIGATIONS INTO CORRELATIONS BETWEEN SULFATE CONTENT AND FLUORIDE CONTENT OF LEAVES OF FAGUS-SILVATICA (COPPER-BEECH), AND THEIR SIGNIFICANCE FOR DEMARCATION OF IMMISSION-AREAS IN LARGE TOWNS ZENTRALBLATT FUR BAKTERIOLOGIE PARASITENKUNDE INFEKTIONS-KRANKHEITEN UND HYGIENE ERSTE ABTEILUNG ORIGINALE RIEHE B, 1972, 155 (5-6): : 435 - &