Treaties — Conclusion and operation — Constitutional limitations — External affairs power of Federal State — Interpretation of ‘external affairs’ — Whether a matter of international concern — Whether implementation of treaty relevant — Whether affecting relations with other international persons — Norm of non — discrimination on grounds of race — Whether customary international law — Effect on Commonwealth or State statutes — Commonwealth Constitution section 51(26) and (29) — Refusal to approve land transfer to Aboriginals — Claim under Racial Discrimination Act 197 5, sections 9 and 12 — Act implementing International Convention on the Elimination of All Forms of Racial Discrimination, 1966 — Locus standi of plaintiff — Whether a ‘person aggrieved’ under section 24 of Act — Constitutional validity of Act — Whether an exercise of power to legislate for race for which special laws necessary — Whether sections 9 and 12 of Act special or general laws — The law of Australia