Most of the justices including mason, Murphy, Brennan and Deane jj etc

External Affairs:-
Most of the justices including mason, Murphy, Brennan and Deane jj etc
Held that commonwealth could give effect  to the convention under the external affairs poerr,
Although the national parks regulations were held to be invalid since Deane j thought opposing the views of the other three majority justices,that the regulations affected on acquisition of property for which  the world heritage act failed to provide just terms as required by S51(XXXi)
Of the constitution,
Prohibitions in the relevant section of the act were held to be invalid since DeanJJ and Brennan thought that they were very wide to be a proper way for affecting the conventions
These prohibitions under act was upheld under external affairs power  Dean j had found difficulties with the national parks regulations due to these prohibitions and then brennan as well as Dean jj had found with the substantive prohibitions in the world heritage act