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These my give some hints how to expand the article. I am surprized this article is misssing from Wikipedia despite the subject being talked about many times on Wikipedia. — Preceding unsigned comment added by Lembit Staan ( talk • contribs) 23:15, 12 May 2021 (UTC)
I understand that it's similar, but I don't see why that map should go on this page. This article has nothing to do with light. AllegedlyHuman ( talk) 21:19, 2 June 2021 (UTC)
Has anyone done a study correlating Wikipedia's geographical coverage with available reliable sources? If there is no citeable source we cannot create an article. In this regard, how much is Wikipedia a proxy for availability of sources? · · · Peter Southwood (talk): 09:38, 13 August 2022 (UTC)