Samoa Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to United States was US$18 during 2019, according to the United Nations COMTRADE database on international trade. Samoa Exports of pebbles, gravel, flint, macadam of slag, tarred macadam to United States - data, historical chart and statistics - was last updated on May of 2024.