Regarding the Historically Speaking box:
If the price is reasonable, go get it, it's a great rarity!
Disc 1:
The Inferno Suite (4 tracks)
previously unissued, not available elsewhere, recorded April 15, 1967
5 tracks from the New World Session recorded January 26-28, 1963
3 tracks from the Faces Suite, unissued recording December 14, 1967
not available elsewhere
4 tracks from Sax No End, June 18, 1969
Disc 2:
10 tracks from the All Smiles and More Smiles sessions, May 1968 and May 1969
4 tracks from the Folk Songs session, July 31, 1967
previously unissued, not available elsewhere
5 tracks from the Gyson session, December 15, 1967
previously unissued, not available elsewhere
The unissued material makes it worth the price alone. The music is great throughout. It was originally sold for the equivalent of 75 $.