Historical clue formulations

• Noted example of oligopoly, in brief — 2026-07-12
• Grp. that adjusts oil production — 2026-06-23
• The U.A.E. is in it — 2025-10-31
• Major oil cartel, in brief — 2025-10-21
• Well-connected grp.? — 2025-03-02
• International grp. based in Vienna — 2024-10-06
• International grp. with many African members — 2024-04-08
• International oil grp. — 2024-02-21
• Grp. that Qatar left in 2019 — 2024-02-06
• Qatar left it in 2019 — 2023-11-25
• Oil industry acronym — 2023-10-15
• Noted example of oligopoly, in brief — 2023-10-06
• Intl. price-setting group — 2023-09-27
• Grp. with many Mideast members — 2023-07-17
• Grp. with barrels — 2023-06-11
• Crude letters — 2023-06-01
• Oil price-regulating grp. — 2023-04-17
• International grp. headquartered in Vienna — 2023-02-19
• Org. that has more members in Africa than in the Mideast — 2023-01-28
• Reserve group, in brief? — 2022-08-20
• Intl. group with members on three continents — 2022-05-18
• Major oil acronym — 2022-01-26
• International grp. founded in Baghdad in 1960 — 2021-12-29
• Intl. group that has no members in Europe or North America — 2021-11-22
• International grp. founded in 1960 in Baghdad — 2021-09-22
• International grp. with a 1970s U.S. embargo — 2021-07-12
• International grp. that's well financed? — 2021-07-09
• International grp. founded in Baghdad — 2021-06-08
• Grp. that sets oil benchmarks — 2020-12-07
• Big Mideast inits. — 2020-11-17
• Kuwait is a member of it, in brief — 2020-09-17
• Big oil cartel, in brief — 2020-04-28
• Europe-based grp. with no European members — 2020-04-19
• Intl. group of oil producers — 2020-03-16
• Intl. group founded in 1960 with five members — 2020-01-05
• Grp. with many Mideast members — 2019-12-09
• Equatorial Guinea is its least populous member, for short — 2019-12-04
• Grp. headquartered in Austria, which isn't a member — 2019-10-22
• Oil producers' grp. — 2019-07-22
• Grp. that's well-financed? — 2018-11-08
• Equatorial Guinea joined it in 2017 — 2018-08-25
• Oil grp. — 2018-07-16
• Grp. whose members have reserves — 2018-05-23
• Intl. group with two South American members and none in North America — 2017-06-27
• Oil cartel — 2017-06-05
• Grp. that includes Iraq and Qatar — 2017-01-16
• Crude letters? — 2016-11-23
• Well-funded grp.? — 2015-11-19
• Intl. group headquartered in Vienna — 2015-11-08
• Grp. that knows the drill? — 2015-04-12