Columbia Records continue to mine Bob Dylan’s never-ending source material with the release of the latest instalment in the acclaimed Bootleg series this August.

The Bootleg Series, Vol. 10 - Another Self Portrait (1969-1971) features 35 rarities and previously unreleased recordings, including the first complete release of Dylan's 1969 Isle of Wight Festival performance with The Band, and comes in both a standard two-disc set and in a four-disc deluxe box set.

The unreleased recordings, demos and alternate takes are mainly taken from the 1969 and 1970 studio recording sessions which resulted in the 1970 Self Portrait and New Morning albums.

Featured in the new Bootleg series release are a demo version of Went To See The Gypsy, and unreleased versions of Spanish Is The Loving Tongue, Railroad Bill and Working on a Guru.

Watch a preview trailer here:

The original Self Portrait was Dylan's tenth studio album and was his first to be really panned by the music press. "What is this shit?" was the memorable opening sentence of critic Greil Marcus's review in Rolling Stone.