Bob Dylan is reportedly "strongly leaning" toward focusing on his gospel period for the thirteenth installment of his archival bootleg series.

The only other set under major consideration is one that chronicles the 1974 Blood on the Tracks sessions, according to a source.

"Personally I think the gospel set is more interesting," says a source close to the Dylan camp.

"Blood on the Tracks is similar to The Cutting Edge in what you're hearing is different version of the same thing.

You're hearing process. The gospel is a lot of stuff that people ignored.

Bob continued to tweak the gospel stuff on the road for a couple of years. It kept mutating."

Dylan's gospel period ran from 1979-1981. A documentary about Dylan's 1975/76 Rolling Thunder Revue tour is also in the works.