For a Document under version control (for more details, see section 4.8), the Info page presents a table of the version history. If the authors of the different versions have provided instructive descriptions of the changes they have made, this table helps you to access the version just prior to a critical modification:
to download an older version of the Document.
The top button bar in the Info page of a Document under version control may offer some actions that are specific to objects of this type:
to bring up a form which lets you edit the version number, state and change description of the current version of the Document.
to bring up a form that lets you create a new version branch.
to bring up a form that lets you indicate the version(s) to be deleted.
action is irreversible.