THE STATE OF THE ESTONIAN COASTAL WATERS IN 1979–1990: SEASONAL, VERTICAL, AND HORIZONTAL VARIATIONS; pp. 129–136

ECOLOGICAL RELATIONS OF MAIN PLANKTON COMPONENTS IN THE PELAGIAL OF LAKE PEIPSI; pp. 137–155

RESPONSE REACTIONS OF CONIFERS TO ALKALINE DUST POLLUTION. CHANGES IN THE PIGMENT SYSTEM; pp. 156–173

INVESTIGATION OF MICROCOMPONENTS IN THE SNOW COVER IN TALLINN; pp. 174–180

IMPACT OF THE KUNDA CEMENT PLANT (NORTH-EAST ESTONIA) EMISSION ON THE DISTRIBUTION OF EPIPHYTIC LICHENS; pp. 181–185