| Intl. cartel since 1960 | 23 |
| Intl. association since 1960 | 28 |
| Intl. acronym since 1960 | 24 |
| International oil cartel | 24 |
| International cartel | 20 |
| Internat. cartel | 16 |
| Indonesia recently quit it | 26 |
| Indonesia left it in 2008 | 25 |
| Indonesia joined it in 1962 ... and left in 2008 | 48 |
| Indonesia is in it | 18 |
| Indonesia is considering withdrawing from it | 44 |
| In-the-news cartel | 18 |
| Grp. with crude interests? | 26 |
| Grp. with crude interests | 25 |
| Grp. with clout at the gas pump | 31 |
| Grp. with barrels | 17 |
| Grp. with an Energy Studies Department | 38 |
| Grp. that may call on its reserves? | 35 |
| Grp. that includes Nigeria | 26 |
| Grp. that includes Iran and Iraq | 32 |
| Grp. that includes Ecuador and Venezuela | 40 |
| Grp. that has the world over a barrel? | 38 |
| Grp. that has held summit meetings in Caracas and Riyadh | 56 |
| Grp. of oil producers | 21 |
| Grp. making barrels of money? | 29 |
| Grp. including Nigeria and Venezuela | 36 |
| Grp. including Iran and Iraq | 28 |
| Grp. in which many of the leaders wear robes | 44 |
| Grp. founded in Baghdad, 1960 | 29 |
| Grp. founded in 1960 | 20 |
| Grp. created at the Baghdad Conference, 1960 | 44 |
| Group that sells its product by the bbl. | 40 |
| Group that includes the U.A.E. | 30 |
| Group incl. the U.A.E. | 22 |
| Gp. with Venezuela and Ecuador as members | 41 |
| Gp. with Indonesia and Algeria as members | 41 |
| Gp. with crude pipelines | 24 |
| Gp. with crude interests? | 25 |
| Gp. with crude interests | 24 |
| Gp. that Indonesia was once a member of | 39 |
| Gp. that includes Venezuela, Qatar and Libya | 44 |
| Gp. that includes Nigeria and Iraq | 34 |
| Gp. that includes Iran and Iraq | 31 |
| Gp. that includes Iran and Ecuador | 34 |
| Gp. that has energy users over a barrel? | 40 |
| Gp. that Gabon left in 1995 | 27 |
| Gp. that Ecuador left in 1992 | 29 |
| Gp. that delivers crude material | 32 |
| Gp. in the oil field | 20 |
| Gp. headquartered in Vienna, Austria | 36 |
| Gp. for Qatar | 13 |
| Gp. behind gas prices | 21 |
| Gas grp. | 8 |
| Gas group | 9 |
| Gabon and Indonesia are members of it | 37 |
| Fuel price setter, for short | 28 |
| Fuel grp. | 9 |
| Fuel gp. | 8 |
| Fuel cartel, briefly | 20 |
| Fuel cartel (abbr.) | 19 |
| Famous cartel initials | 22 |
| Energy-focused org. | 19 |
| Energy cartel, in brief | 23 |
| Energy cartel since 1960: abbr. | 31 |
| Energy cartel since 1960, briefly | 33 |
| Energy cartel letters | 21 |
| Energy bloc | 11 |
| Ecuador joined it in 2007 | 25 |
| Ecuador is a member of it | 25 |
| Ecua. rejoined it in 2007 | 25 |
| Crude org.? | 11 |
| Crude group: abbr. | 18 |
| Crude gp.? | 10 |
| Crude cartel: Abbr. | 19 |
| Crude bloc | 10 |
| Crude acronym? | 14 |
| Contemporary cartel | 19 |
| Cartel since '60 | 20 |
| Cartel led by a secretary general | 33 |
| Cartel including Saudi Arabia (Abbr.) | 37 |
| Black gold gp. | 14 |
| Big oil gp. | 11 |
| Big NYSE influence | 18 |
| Big acronym in energy | 21 |
| Barrel-producing grp. | 21 |
| Barrel-making gp.? | 18 |
| Barrel-conscious gp. | 20 |
| Barrel producer's grp. | 26 |
| Assn. that includes Iraq and Venezuela | 38 |
| Assn. most recently joined by Angola | 36 |
| Angola joined it in 2007 | 24 |
| Acronym in 70's news | 24 |
| Acronym for an oil group | 24 |
| Acronym for an oil cartel | 25 |
| Acronym for a powerful cartel | 29 |
| Acronym for a fuel cartel | 25 |
| Acronym for a cartel in the news | 32 |
| 12-member cartel | 16 |
| 11-nation cartel | 16 |
| "Well"-financed org. | 30 |