I don't think 'Agharta' was issued in the US in the 1970s porcy so that white-label promo of yours seems odd . I know that it was also issued in Japan with a glossier (and thicker card) cover back then (as I've got one of those too) but I read somewhere it came out there about 18 months after the recording (ie. mid-'76). Which would make the UK/European issue the first full release. The CD of course only came out in the US around 1990.
The UK issues of 'Agharta', 'Get Up With It', 'Bitches Brew' and 'Big Fun' were some of the earliest LPs I ever bought, around 1975. All sound excellent too.
For some reason they never chose to issue 'Pangaea' over here at time of release. 'Agharta' must have freaked out UK CBS's management too much !