Click the title of your file and select Version history. Select a version to open it in a separate window. If you want to restore a previous version you've opened, select Restore. Important: If your experience looks different, select one of the tabs above to try the instructions for another version. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.