GIS-BASED ESTIMATION OF SHORELINE CHANGE AT THE OLIE PIER HARBOR HERITAGE SITE, MANGGAR, EAST BELITUNG, INDONESIA oleh Anninda SABINA, YULIUS, Syamsul B. AGUS, Hadiwijaya L. SALIM, Ira DILLENIA, Taslim ARIFIN, Joko PRIHANTONO, Dini PURBANI, Aida HERIATI, Muhammad RAMDHAN, Siti Hajar SURYAWATI, Ary WAHYONO, Ulung Jantama WISHA, ZULFIANDI