Explanatory notes
… 25.17 ‑ Pebbles, gravel, broken or crushed stone, of a kind … of heading 25.15 or 25.16, whether or not heat‑treated. 2517.10 ‑ Pebbles, gravel, broken or crushed stone, of a … ballast, shingle and flint, whether or not heat‑treated 2517.20 ‑ Macadam of slag, dross or similar industrial …