Bigus, Katarzyna, Astel, Aleksander, Stec, Marcin, AND PiskuĊ‚a, Paulina. " SPATIOTEMPORAL VARIATION OF BIOCHEMICAL COMPOSITION OF ORGANIC MATTER AND NUMBER OF BACTERIA IN CORE SEDIMENTS OF SELECTED BEACHES OF THE SOUTHERN BALTIC SEA" Baltic Coastal Zone [Online], Volume 21(1 December 2017)