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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 50 | next 50) (20 | 50 | 100 | 250 | 500)- Norway (49 members)
- Nostrum (2 members)
- Novatek (1 member)
- OKEA (1 member)
- OMV (6 members)
- ONGC (2 members)
- ORPC (2 members)
- Oman (8 members)
- One Dyas (1 member)
- Oneok (4 members)
- Orlen (2 members)
- Oxy (17 members)
- PAA (1 member)
- PBF (7 members)
- PDVSA (2 members)
- PKN Orlen (5 members)
- PNG (4 members)
- PTT (1 member)
- PTTEP (3 members)
- Pakistan (3 members)
- Pembina (1 member)
- Pemex (8 members)
- Perenco (2 members)
- Pertamina (10 members)
- Peru (2 members)
- PetroRio (6 members)
- Petrobras (31 members)
- Petrochemical (32 members)
- Petrochina (7 members)
- Petron (2 members)
- Petronas (19 members)
- Petroperu (1 member)
- Petrovietnam (1 member)
- Philippines (1 member)
- Phillipines (1 member)
- Phillips66 (14 members)
- PipeChina (1 member)
- Pipeline (87 members)
- Plains All American (1 member)
- Poland (6 members)
- Portugal (3 members)
- Prax (1 member)
- Processing (16 members)
- Project (1 member)
- Qatar (8 members)
- QatarEnergy (3 members)
- Qatarenergy (1 member)
- Qatargas (1 member)
- RWE (1 member)
- Refinery (407 members)