The latest edition of the VOC Songbook was completed in the Fall of 2015. You can come and grab a copy for $5 during Gear Hours in the Clubroom.
The raw files are available at VOC Songbook 2015. You can download the songbook on that page as well.
You can find a list of corrections here.
There's also a Youtube Playlist of the songs included in the songbook and a torrent of the songs. Listen, learn and sing.