Actually, thinking about this a bit more, I doubt that it would be legal in Italy or in any other jurisdiction, regardless of the smaller time spans of some copyright laws, if these recordings were never legitimately issued beforehand. The title is obviously a play on the original Dylan bootleg "The Great White Wonder" from 1969 or thereabouts, the tapes for which were stolen from Columbia's vaults IIRC; I wouldn't be surprised if these releases were copied from that album.
If it's not licensed from Columbia, CBS, Sony or whatever their name was at any given point, consider it unauthorized. It may well be legal in Italy under their laws (I don't know), but that's a long way from being "official" or "legitimate".
I do not know if this is legit or not. At the time (75/76) they were all over the place, most record shops had them, but I bought them as "bootlegs". At least I have them filed as such ever since. But what do I know, I was so much older then..... Perhaps some peculiarties of Italian copyright laws?
There were several different versions of these, different kind of labels, covers and countries, still found frequently. And some, or most?, of it much, much later found it's way into officialdom as part of the "Official Bootlegs" series.
B1 is "Outlaw Blues", btw., no others triggered much for me on listening.
All studio takes, demos presumably, strictly acoustic solo guitar/harmonica.
Interesting. The LP screams bootleg, and yet the Joker label is an established budget label in Italy, like, say mfp in the UK. Can this really be official though?