As Of Filer Filing For·On·As Docs:Size Issuer Agent 5/12/11 Unit Drilling & Exploration Co 424B2 1:3.5M RR Donnelley/FA Unit Corp Unit Drilling Co Unit Petroleum Co Superior Pipeline Company, L.L.C. Unit Texas Drilling, L.L.C. Superior Appalachian Pipeline, L.L.C. Superior Pipeline Texas, L.L.C. Unit Drilling USA Columbia, L.L.C. Unit Drilling Columbia, L.L.C. Preston County Gas Gathering, L.L.C. Petroleum Supply Co Unit Texas Co
Document/Exhibit Description Pages Size 1: 424B2 Final Prospectus Supplement HTML 2.60M