United States · Heading· 4 subheadings· 0 codes

4406Railway or tramway sleepers (crossties) of wood

Subheadings (6-digit WCO)

440611Coniferous→440612Non-coniferous→440691Coniferous→440692Non-coniferous→
United States HS 4406 · Railway or tramway sleepers (crossties) of wood · Treayo