Research Institute of North China Petroleum Bureau
The Plan and Design Institute of North China Petroleum Bureau
North China Bureau of Petroleum Geology
华北石油局规划设计研究院
地质矿产部华北石油地质局
华北石油地质局地质大队
Great Debate between British and North American Schools
construction of ecological Three-North Regions of
conjunction area of North Qinling and Qilian
Comprehensive reconnaissance survey team of North China Nonferrous Metals Geo-exploration Bureau
compared to North China
cold vortex over North China
Cold Vortex in North China
Cold region of North China
coastal region north and east of Shandong Peninsula
Coalfields in North China
coal-bearing area in Qilian Mountains and north Ca