User talk:87.243.150.98

June 2018
Hello, I'm Jim1138. I noticed that you made a change to an article, Johannes Diderik van der Waals, 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. Jim1138 (talk) 05:51, 6 June 2018 (UTC)
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