Mule Skinner Blues - trad. (Real Bluegrass Book)

[Bobsax]

Mule Skinner Blues - trad from BG Realbook
There wasn't room for the fiddle part so this is just the verse and solo section.
I just checked this arrangement against Bill Monroe Peter Rowan and Tony Rice's versions and it's different from all of them.
I don't know where the editors of the Real Bluegrass Book got this version??