1 . COMMON CUSTOMS TARIFF - TARIFF HEADINGS - INTERPRETATION - EXPLANATORY NOTES OF THE CUSTOMS COOPERATION COUNCIL - OPINIONS OF THE COMMITTEE ON COMMON CUSTOMS TARIFF NOMENCLATURE - AUTHORITY 2 . COMMON CUSTOMS TARIFF - TARIFF HEADINGS - HEADINGS NOS 44.05 AND 44.13 - DELIMITATION OF THEIR SCOPE - CRITERIA - CLASSIFICATION OF BALSA WOOD