Related Clues:

• Crude amt.
• OPEC amounts, briefly
• OPEC amts.
• Ener.-related units
• OPEC unit of measure
• Oil meas.
• OPEC output
• Barrel, abbr.
• Crude measurement: Abbr.
• Five cu. ft. of sugar
• Crude oil meas.
• OPEC unit: Abbr.
• 42 gal.
• Crude qty.
• Peak oil meas.