Thanks for this contribution, Neil.
I shall certainly look out for these books. I shall be introducing a series of talks on the influence of print on folk song at Cecil Sharp House on Feb 26th.
The point made on p.48 above is significant. Before the 19th century the 'folk' would not have been able to afford to buy the print even if they could read it. So what they picked up that originated in print one presumes had filtered down through oral tradition from the better off.