Related Clues:

• Book on which 'There Will Be Blood' was based
• Nigerian export
• It can be crude or refined
• Little squirt, maybe
• Recent commodity index booster
• Atar, for one
• Crude cargo
• Cartel commodity
• Alaska resource
• A splash in the pan
• Masseuse's supply
• Well output, perhaps
• Squeak quieter
• Alaska's main export
• Maintain, as some tools