Turb - Unit
- Uncompleted wells, equipment, and facilities costs
- Unconditioned space
- Unconsolidated entity
- Unconventional oil and natural gas production
- Underground gas storage
- Underground gas storage reservoir capacity
- Underground Home
- Underground mine
- Underground mining equipment
- Underground mining methods
- Underground storage
- Underground storage injections
- Underground storage withdrawals
- Undifferentiated/unspecified reserves and production
- Undiscovered recoverable reserves
- Undiscovered resources
- Unfilled requirements
- Unfinished oils
- Unfractionated streams
- Unglazed Solar Collector
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