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That edit was was more than two years, so I don't remember the full context. But my edit summary gives the gist of it: reference system and reference frame are different concepts and I think ideally they should have separate articles. I envision the reference system article talking about the protocol or system for creating and coming to consensus on a reference frame. Then the reference frame article would talk about the history, impact and uses of the set of reference frames that have been created. How a book is manufactured and how that book is used are obviously related, but that doesn't mean that the publisher and the book should be merged into the same article.
That said, both articles are fairly short at present and a merge could be successful if both topics are clearly distinguished in the merged article. International Terrestrial Reference System and Frame is also two separate topics sitting in the same article, but it is so stubby that it doesn't make sense to split it at this point. --{{u|Mark viking}} {Talk}00:53, 15 July 2021 (UTC)[reply]
The US Naval Observatory site is being re-organised so the links to this site including references [1], [2] & [3] are broken. Replacements for these pages do not seem to exist but may be restored when the work on the website is complete (some time in 2022).