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ALON USA Energy, Inc. View Letter Jan 2009
BP Australia View Letter Mar 2010
Caltex Australia View Letter
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Chevron Products Company View Letter Jun 2006
CITGO Petroleum Corporation View Letter Mar 2002
Consumers' Co-operative Refineries Limited View Letter Mar 2010
Delek Refining Ltd. View Letter Dec 2012
ExxonMobil Lubricants & Petroleum Specialties Company View Letter Feb 2008
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Hess Corporation View Letter Jun 2010
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Monroe Energy LLC View Letter Jun 2012
Murphy Oil USA, Inc. View Letter May 2010
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PBF Energy View Letter Dec 2010
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Shell Quality Management View Letter Jul 2009
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Sunoco Inc. View Letter Nov 2002
Tesoro Refining and Marketing Company View Letter May 2003
The Shell Company of Australia Limited View Letter Apr 2010
TOTAL Petrochemicals & Refining USA, Inc. View Letter Nov 2008
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AltaGas Ltd. View Letter Aug 2011
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BP Pipelines & Logistics View Letter Mar 2002
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DCP Midstream View Letter
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Dow Pipeline View Letter Aug 2003
Eagle Rock Energy Partners View Letter Jun 2011
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Energy Transfer Company View Letter Aug 2007
Enterprise Products View Letter Jan 2002
Explorer Pipeline View Letter Nov 2001
ExxonMobil Pipeline Company View Letter Apr 2002
Holly Energy Partners View Letter Aug 2007
Keyera Corp. View Letter Oct 2008
Kinder Morgan View Letter Jan 2002
Koch Pipeline Company, L.P. - Corporate View Letter Mar 2001
LOOP (Louisiana Offshore Oil Port), LLC View Letter Jun 2003
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NuStar Energy L.P. View Letter
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NuStar Terminals Limited View Letter
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Pembina Pipeline Corporation View Letter May 2011
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Plains Midstream Canada ULC View Letter Aug 2008
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SemGroup Corp View Letter Aug 2011
Shell Pipeline S&D US View Letter Jan 2002
Spectra Energy View Letter Dec 2008
Sunoco Logistics Partners, LP View Letter Jan 2003
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Targa Resources View Letter Feb 2008
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Berry Petroleum Company View Letter May 2012
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BP Canada View Letter
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BP Exploration & Production (United States) View Letter Sep 2007
Cabot Oil & Gas View Letter May 2011
Cenovus Energy Inc View Letter Jul 2008
Chaparral Energy View Letter Sep 2010
Chesapeake Energy View Letter Oct 2009
Chevron AMBU View Letter Jan 2011
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Chinook Energy Inc. View Letter Mar 2011
Cimarex Energy View Letter Jun 2011
Connacher Oil & Gas Limited View Letter Apr 2008
ConocoPhillips Alaska View Letter Sep 2007
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Denbury Resources Inc. View Letter Feb 2002
Devon Canada Corporation View Letter May 2007
Devon Energy Corporation View Letter Feb 2004
Direct Energy View Letter Sep 2011
Dover Operating Corp. View Letter Aug 2011
EF Energy View Letter May 2011
Encana Corporation [Canadian Division] View Letter Jul 2008
Enerplus View Letter Jan 2011
EOG Resources Canada, Inc. View Letter Feb 2007
EXCO Resources View Letter Sep 2009
Fidelity Exploration & Production Company View Letter Sep 2012
Hess Exploration and Production View Letter
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Husky Energy View Letter Nov 2006
Jones Energy View Letter Nov 2012
KM LNG Operating General Partnership View Letter Nov 2010
Koch Mineral Services LLC View Letter Mar 2006
Laredo Petroleum View Letter Jun 2012
Marathon Oil View Letter
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McMoRan View Letter Jan 2006
Murphy Exploration and Production Company View Letter Oct 2009
Newfield Exploration Company View Letter Sep 2012
Nexen Inc. [Canadian Division] View Letter Jun 2006
Noble Energy, Inc. View Letter Dec 2005
Northern Blizzard Resources Inc. View Letter Aug 2010
Osum Oil Sands Corp View Letter Aug 2009
OXY USA Inc. View Letter Sep 2004
Pace Oil & Gas Ltd. View Letter Aug 2012
Penn West Petroleum Ltd. View Letter Aug 2009
Pennsylvania General Energy View Letter Nov 2011
Phillips 66 Services View Letter Dec 2008
Pioneer Natural Resources View Letter Jul 2012
Plains Exploration and Production Company View Letter Aug 2003
Quantum Resources Management, LLC View Letter Oct 2011
Repsol Services Company and Affiliates View Letter Dec 2006
Rice Energy View Letter Apr 2012
Samson Exploration View Letter Aug 2012
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SandRidge Energy View Letter Oct 2011
Shell Supply & Distribution Canada View Letter Aug 2008
Shell Upstream Americas View Letter Oct 2004
SM Energy Company View Letter Apr 2008
Southern Pacific Resource Corp View Letter May 2011
Southwestern Energy Company View Letter Apr 2010
Statoil View Letter Feb 2007
Swift Energy Company View Letter Sep 2012
Talisman Energy Inc View Letter Jan 2010
Talisman Energy USA Inc. View Letter Apr 2010
T-C Oil Company, LLC View Letter Jul 2010
The Rumaila Operating Organisation (ROO) View Letter
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Total E&P Canada View Letter Oct 2012
Ultra Resources View Letter May 2010
W&T Offshore View Letter Apr 2007
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XTO Energy View Letter Feb 2006
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