Except for a handful I wouldn't bother dealing separately with the RH ballads as they all appeared together in the various RH Garlands from the middle of the 17th century right into the middle of the 18th and then at the end of the 18th appeared separately on upmarket broadsheets printed by the likes of Lawrie and Whittle.

It might be worth including the reference to Pepys having heard Barbara Allen sung in the theatre in the 17th century.

It would appear that Child had access to the Percy Mss. I wonder why they were never published.

Keep em coming, John.