Apparatus, systems, and methods may operate to determine a proximate save time difference between a target version of electronic content and a next (proximate in time and newer) version of the electronic content. An aged save time difference may be determined as the time difference between the current time and either one of the target version or the next version. The target version of the electronic content may be pruned from a plurality of revisions of the electronic content if the proximate save time difference is less than a selected fraction of the aged save time difference. The plurality of revisions, less the pruned revisions, may be displayed along a historical time line as part of a graphical user interface.