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We have about 30 pages of content that we are hiding from the website as these articles had some issues. If these pages ranked well, would you recommend that the new content is written within these pages? Meaning, we would replace the content that's in those pages with the same topic and keywords. Or do you think it's best to start a new page instead?

Is it true that cornerstone content should have at least 3,500 words? I've done some research and found that the recommended amount is between 2K-10k. Also, the content that we create/publish has a lot of references/citations at the end of each article. Does Google discern words from the main text and from the references? Meaning should I count references as part of the word count? Thanks for the help!