ECOLOGY AS A SCIENCE, ITS SUBJECTS AND SUBDIVISION; pp. 2–9

INVESTIGATION OF EFFECTS OF FOREST STRESS FACTORS ALONG EXPOSURE GRADIENTS IN THE UNITED STATES; pp. 10–26

ON THE METHODOLOGY OF COMPLEX GEOECOLOGICAL STUDIES; pp. 27–41

RADIONUCLIDES VARIATION IN MACROLICHENS IN ESTONIA AFTER THE CHERNOBYL ACCIDENT; pp. 42–51