User talk:66.18.39.250

April 2017
Hello, I'm BilCat. I noticed that you made a change to an article, Optical landing system, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. BilCat (talk) 01:51, 10 April 2017 (UTC)
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