Typewritten Bob Dylan draft lyrics found inside book

Lyrics written by Bob Dylan and found tucked inside a poetry book will go up for auction.

They could sell for up to £40,000 ($A77,000).

The torn page contains typewritten draft lyrics with a number of amendments to Dylan's song I'm Not There from his 1967 Basement Tapes sessions.

The song was only released decades later, in 2007, as part of the soundtrack for the Todd Haynes film about the songwriter.

The lyrics were discovered inside a first edition poetry book by Allen Ginsberg who was a long-time friend of the singer.

It is believed to have been hidden away in the book, Ankor Wat, since Ginsberg gave it in 1969 to model Sally Grossman – another friend of Dylan's and the wife to his first manager, Albert Grossman.

The book also includes a signature and inscription by Ginsberg to Sally who famously featured on the cover of his 1965 album Bringing It All Back Home.

The lyrics and the book will go under the hammer on April 21 with Omega Auctions and are expected to sell for between £20,000 ($A38,000) and £40,000 ($A77,000).

Dan Muscatelli-Hampson of Omega Auctions said: "This is a remarkable discovery and one that is sure to provoke great excitement amongst the Dylan scholars, fans and collectors around the world.

"The provenance story is fascinating, not least because the book had passed through several hands before our vendor was eventually the lucky owner who carefully leafed through the book to find this exceptionally rare page hidden inside."

Dylan is one of the most acclaimed songwriters of all time, winning 10 Grammys and being nominated on 38 further occasions.

He was awarded the Nobel Prize in Literature in 2016.

The singer-songwriter was recently portrayed by actor Timothée Chalamet in the biopic A Complete Unknown.