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If an editor changes or removes content from an article the old versions of the article are still available from the article's history. To view article history, click on the "history" tab for any article, then click on the date for the revision that you are interested in. To revert the article to the specified revision, simply click on the "edit" tab while viewing the old version and then re-save the version. Alternately, if you just want to revert a single edit, click on the "undo" link from an article's history next to the edit that is being reverted.