i got this off a bootleg dvd from chicago 1970. Considering the age of it its whatchable

Sure the year is right?

Gotta be 1974 - 1976.
 
From the Jacket, I'd say 1975.
 
Love to know more about that DVD . . . too. Are you able to share info on where/how you got it?

that website is no longer active
i must have downloaded 75 performances from various artists while they were up
even have some b&w dead