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| Altus Expert Services |
Crest Tax Partners |
American Electric Power |
AT&T |
| Atmos Energy Corp. |
Blueknight Energy Partners, LP |
BNSF Railway Company |
BP America |
| Cheniere Energy |
Chevron Services Company |
CHS McPherson Refinery |
CITGO Petroleum Corporation |
| Commercial Metals Company |
Compressco Partners LP |
Continental Resources, Inc. |
Cost Containment Advisors |
| Cummings Westlake, LLC |
DCP Midstream |
Deeprock Energy Resources LLC |
Devon Energy Corp. |
| DuCharme McMillen & Associates |
Duff & Phelps |
EDP Renewables |
Elias, Books, Brown & Nelson |
| Enable Midstream Partners LP |
Enbridge Energy |
Enlink Midstream |
Enel Green Power North America Inc |
| EOG Resources, Inc |
Exxon Mobil |
E&Y |
Grant Thornton |
| Hall Estill |
Halliburton |
Hammond & Company of Oklahoma |
ITC Holdings Corp |
| J. Joseph Consulting Inc |
Jayhawk Pipeline LLC |
JMA Energy Co, LLC |
K.E. Andrews & Company |
| Kinder Morgan Inc |
Lane Property Tax |
Locin Oil/NCL |
Logix Communications, LP |
| Macquarie Group of Companies |
Magellan Midstream Partners |
MarkWest Energy Partners, LP |
Merit Advisors LLC |
| Mordy & Mordy, Inc |
NextEra Energy |
NGL Energy Partners |
Northern Natural Gas Company |
| NuStar Energy, LP |
OG&E Energy Corp |
Oklahoma Oil and Gas Association |
Oklahoma Railroad Association |
| One Gas Inc |
ONEOK |
Oxy, Inc |
Phillips 66 Company |
| Phillips Murrah |
Pioneer Telephone Cooperative |
Plaines All American Pipeline |
Plains Pipeline, LP |
| Pratt & Associates |
Propertyt Tax Partners LLP |
PTX Tech |
R.E McElroy, LLC |
| Reynolds Tax Consultants LLC |
Ryan & Company |
SAK Consulting |
Sartain Fisehbein & Company |
| Savage, Savage & Brown, Inc. |
SemGroup Corp |
SernGroup Corporation |
Southern Star Central Gas Pipeline, Inc. |
| Sprint Nextel |
Stancil & Co |
Stephens Production Company |
Targa Resources |
| Taxography, Inc |
TC Energy |
Tenaska |
TETRA Technologies, Inc |
| The Armstrong Company |
T-Mobile USA |
TRMG, P.C. |
Union Pacific Railroad |
| Unit Corporation |
Valero Energy Corp |
Verizon Wireless |
Williams |
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