I just noticed there's a free ebook (http://www.amazon.com/Golden-Road-Beyond-Grateful-Primer-ebook/dp/B00G0062O2/ref=sr_1_1?s=books&ie=UTF8&qid=1405715579&sr=1-1&keywords=grateful+dead) at Amazon from/about the Grateful Dead. I just downloaded it, and haven't read it yet; but the reviews suggest this is a compilation of the introductions to the GD studio album boxed sets, though the estimated length is 134 pages. But so far the best part is it's free.
It's also available at the ibook store.
Bill, tgo