If you like that DP 18 Deal, check the Deal out from New Haven a few weeks later DP 25. I've got both on my iPhone.
Those 70's Deals differed from the 80's version. Just a vocal jam at the end, but Garcia's solos over the verse structure were much longer and drawn out and that New Haven one, well glacier's solo is about 2 or 3 verses longer than the DP18 version. In the 80's he played a shorter solo and extended the jam.
A show I was at - Seattle 83 - that was a cooking Deal.