User talk:Professor Kuhn

April 2018
Hello, I'm Donner60. I noticed that you made a change to an article, Richard Kuhn, 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. Donner60 (talk) 03:59, 22 April 2018 (UTC)