Some of these tracks had been released previously. Dark Star was included in the 6CD Box Set "Woodstock: 40 Years On: Back to Yasgur's Farm".
Turn On Your Lovelight was included on the bonus disc in the double DVD version of "Woodstock: 3 Days of Peace & Music: Ultimate Collector's
An exclusive Amazon edition of that DVD had additional bonus material including the Dead's performance of Mama Tried.
(thanks to Matt Schofield's deaddisc.com for this info)