User talk:217.165.142.223

April 2019
Hello, I'm William Avery. I wanted to let you know that one or more of your recent contributions to History of the periodic table have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the help desk. Thanks. William Avery (talk) 09:58, 14 April 2019 (UTC)
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