If you have a Time Machine backup, you could get it from there.
And the easiest way to get the previous version (if you don't have a backup) is install 10.7 or 10.8 on an external disk, patch OS X to 10.7.5 or 10.8.5. Boot from that and install Pages from the App Store. Copy Pages into an iWork '09 folder on the Mavericks disk.