Exploration and Development Research Institute of the North China Oil Field
North China Oil Field Designing Institute
North China oil province
13 provinces in North China
Agriculture-animal husbandry ecotone of North China
agro-pastoral ecotone in North China
agro-pastoral transition zone of north china
Alluvial plain of north China
Amoxicillin-North China Pharm
application in north China
Arid region in North China
Arid region of North China
basin and ridge of North China
Cambrian substrate in the south of north China craton basin
Central North China plain
Ciclosporin-North China Pharm