You can view the differences between two versions of a document that has been edited and published multiple times. You can also delete specific versions or restore a previous version so that it is the current version.
To manage a document's versions, navigate to the document and then click Manage Versions. On the Manage Versions page you can view changes in one version from the preceding by clicking the Changes icon for the later version; you can select the check boxes for any two versions to compare them. You can also restore and delete previous versions.