by the way, Palace Of Fine Arts, SF 11/28/73 shouldn't really be referred to as Seastones. I think it was billed as Garcia & Hart, and Phil mixes and may have added electronics. But I don't believe Lagin participates, though I could be wrong -- hard to tell who emits what electronic squonk much of the time.
It's a great two hours plus of outer space, whoever it is.