1. Sources
  2. OECD International Trade
  3. International Trade By Commodity Statistics (SITC Rev. 2)
  4. 6: Manufactured goods classified chiefly by material
  5. 66: Non-metallic mineral manufactures, n.e.s.
  6. 663: Mineral manufactures, n.e.s
  7. 6637: Refractory goods (eg., retorts, crucibles etc ) n.e.s

6637: Refractory goods (eg., retorts, crucibles etc ) n.e.s

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