User talk:213.87.156.197

June 2019
Hello, I'm Promethean. I noticed that you made a change to an article, Vladimir Vernadsky, but you didn't provide a source. I’ve removed it for now, but if you’d like to include a citation to a reliable source and re-add it, please do so! If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks.  Promethean  (talk) 13:35, 25 June 2019 (UTC)
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