Stamps of China, PRC, 31 Jan 1978
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postage
1978, Jan 31 Development of Petroleum Industry issue unwmk p. 11 (6 stamps)
| - | 8f | multi | Oil-well derrick | |||
| - | 8f | multi | Petroleum production | |||
| - | 8f | multi | Laying of oil lines | |||
| - | 8f | multi | Petroleum Refinery | |||
| - | 8f | multi | Oil port | |||
| - | 20f | multi | oil rig |
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