TY CONF TI SPATIAL AND TEMPORAL VARIABILITY OF GRANULOMETRIC COMPOSITION OF THE BALTIC (VISTULA) SPIT BEACHE SEDIMENTS KW coastal zone JO XXIV International Coastal Conference "SEA COASTS – EVOLUTION, ECOLOGY, ECONOMY" AU Bobykina, V.P. AU Zhurahovskaya, P.M. PY 2024 PB Academus Publishing