TEMPORAL AND SPATIAL CHANGES IN ORGANIC AGENTS IN THE PROGRESS OF PRIMARY PEDOGENESIS DURING THIRTY YEARS; pp. 61–76

LIMING WITH POWDERED OIL-SHALE ASH IN A HEAVILY DAMAGED FOREST ECOSYSTEM.
II. THE EFFECT ON FOREST CONDITION IN A PINE STAND; pp. 77–84

ALLOCATION OF BIOMASS, NITROGEN, AND SULPHUR IN ACID MIST TREATED PLANTS; pp. 85–94

RELATION OF THE COVERAGE OF THE EPIPHYTIC LICHEN HYPOGYMNIA PHYSODES TO BARK CHEMISTRY OF SCOTS PINE; pp. 95–102

CURRENTS IN THE SUUR STRAIT AND THEIR ROLE IN THE NUTRIENT EXCHANGE BETWEEN THE GULF OF RIGA AND THE BALTIC PROPER; pp. 103–123

CHLORINE-RESISTANT MICROBIAL CONTAMINANTS IN DRINKING WATER; pp. 124–133