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- Anderson Exploration Ltd.
- Apache Canada Ltd.
- ARC Resources
- ATCO Midstream
- Burlington Resources
- Canadian Natural Resources Ltd.
- Compton Resources Corporation
- Enerplus Resources Inc.
- Gulf Canada Resources Ltd.
- Morrison Petroleum Ltd.
- NAL Resources
- NEVIS Ltd.
- Nexen
- Encana (Pan Canadian Petroleum)
- Pengrowth
- Penn West Petroleum Ltd.
- Samson Canada ltd.
- Shell Canada Ltd.
- Terra International Inc.
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