<Li> Korea, North </Li> <Ul> <Li> Panama </Li> <Li> Peru </Li> <Li> Philippines </Li> <Li> Poland </Li> <Li> Portugal </Li> <Li> Rhodesia and Nyasaland </Li> <Li> Romania </Li> <Li> South Africa </Li> <Li> Soviet Union </Li> <Li> Spain </Li> <Li> Sweden </Li> <Li> Switzerland </Li> <Li> Taiwan </Li> <Li> Thailand </Li> <Li> Tunisia </Li> <Li> Great Britain </Li> <Li> United States </Li> <Li> Uruguay </Li> <Li> Venezuela </Li> <Li> Vietnam, North </Li> <Li> Vietnam, South </Li> <Li> Yugoslavia </Li> </Ul> <Li> Rhodesia and Nyasaland </Li> <Li> Vietnam, North </Li>

What was the international organization that led to these stations being established in antarctica