INVESTIGATION OF NITRATE EXCRETION IN HUMAN ORGANISM; pp. 161–165

CONTENT AND DISTRIBUTION OF PHOSPHORUS AND NITROGEN IN THE COASTAL WATERS OF WEST ESTONIA; pp. 166–180

DISTRIBUTION OF FISH SPECIES IN ESTONIAN LAKES; pp. 181–186

ECOLOGICAL FACTORS INFLUENCING THE NUMBER OF IRON BACTERIA IN DRAINAGE PIPES; pp. 187–195

ACCUMULATION OF FLAVONOIDS IN TWO DIFFERENT PHENOTYPES OF THE TROPICAL SEAGRASS THALASSODENDRON CILIATUM (FORSKAL) DEN HARTOG; pp. 196–199