义县阶的时代与侏罗系-白垩系界线--义县阶标准地层剖面建立和研究之三
의현계적시대여주라계-백성계계선--의현계표준지층부면건립화연구지삼
The Age of the Yixianian Stage and the Boundary of Jurassic-Cretaceous--The Establishment and Study of Stratotypes of the Yixianian Stage
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