元古宙 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "元古宙" in Chinese language version.

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doi.org

Plumb, K. A. New Precambrian time scale. Episodes. June 1, 1991, 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005 .

flickr.com

Smithsonian National Museum. flickr (photo album).