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| Owner | Owner City | Lease | Operator | NRI | Type | County | Year |
|---|---|---|---|---|---|---|---|
| ABEL M D COMPANY | Lampasas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| ANADARKO E&P ONSHORE LLC | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| ANDERSON ENERGY CORP | Denver, CO | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BENTS FAMILY TRUST | Anacortes, WA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BLACK STONE MINERALS CO LP | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BRADY MARY DEBORA | Plano, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| CAMPBELL DOROTHY LEE | Yeadon, PA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| COOPER FAMILY TRUST | Laguna Hills, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| DORCHESTER MINERALS LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| FORT WORTH MINERALS | Fort Worth, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GAS INVESTORS GROUP LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GREEN LAWRENCE A | Carlsbad, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GREEN R H JR | Healdsburg, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GRINNELL COLLEGE TRUSTEES | Grinnell, IA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| HARMON PEARL M & JULIA | Tulsa, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| HEATH RONALD B & CONSTANCE N | Lone Tree, CO | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LMAM PARTNERSHIP LTD | Midland, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LMCM PARTNERSHIP LTD | West Lake Hills, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MANNING EXEMPT LIFETIME TRUST | Yoakum, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MCMILLAN H M ROYALTY TRUST | Tulsa, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MILLENNIUM ENERGY INC | Ventura, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| PBR PROPERTIES JOINT VENTURE | Midland, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| REED OIL TRUST | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| SOGO III LLC | Midland, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| WATERMARK ROYALTY LP | Wichita Falls, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| WOODUL PAUL | Tulsa, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| ABEL M D COMPANY | Lampasas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| ANADARKO E&P ONSHORE LLC | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BENTS FAMILY TRUST | Anacortes, WA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BITTER END ROYALTIES LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BLACK STONE MINERALS CO LP | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BOWERMAN JAN CATHEY | Wichita Falls, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BRADY MARY DEBORA | Plano, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BRADY MARY LOUISE | Manchester, CT | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BRATTON BILL | Hot Springs, AR | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| BYARS LAWERENCE CRITTENDEN | Fort Worth, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| CAMPBELL DOROTHY LEE | Yeadon, PA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| COOPER FAMILY TRUST | Laguna Hills, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| DORCHESTER MINERALS LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| FORT WORTH MINERALS | Fort Worth, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GARRETT RACHEL JOAN BRADY | Rochelle, IL | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GAS INVESTORS GROUP LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GREEN LAWRENCE A | Carlsbad, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GREEN R H JR | Healdsburg, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| GRINNELL COLLEGE TRUSTEES | Grinnell, IA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| HARMON PEARL M & JULIA | Tulsa, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| HEATH RONALD B & CONSTANCE N | Lone Tree, CO | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LIEDTKE INTERESTS LTD | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LIEDTKE WILLIAM C JR ESTATE | Houston, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LMAM PARTNERSHIP LTD | Midland, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| LMCM PARTNERSHIP LTD | West Lake Hills, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MALONE FRANCES FELL ESTATE | Enid, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MANNING EXEMPT LIFETIME TRUST | Yoakum, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MARCH HARRY E | Green Valley, AZ | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MCMILLAN H M ROYALTY TRUST | Tulsa, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MILLENNIUM ENERGY INC | Ventura, CA | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| MURDOCK OPERATING 2 LP | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| OVEN ELIZABETH FELL ESTATE | Enid, OK | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| PBR PROPERTIES JOINT VENTURE | Midland, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |
| REED OIL TRUST | Dallas, TX | ROBERTSON "6C" #3 | SOGO III LLC | XXXXXXXX | XXXXXXXX | XXXXXXXX | XXXXXXXX |