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- Well-financed org.?
- Grp. with crude interests
- Oil exportation grp.
- Trading grp.
- Oil cartel acronym
- Grp. that includes Nigeria
- Grp. founded in Baghdad, 1960
- Cartel formed in '60
- Oil price-setting grp.
- Acronym since 1960
- 11-mem. oil cartel
- Fuel cartel ...
- Cartel since 1960, briefly
- Qatar's org.
- 1973 embargo org.