Jack, And they're just the famous ones. Many of Harry Clifton's, Joe Geoghegan's, Sam Cowell's songs of the 1860s were found in oral tradition during the last century and some are still turning up. We know the authors of some of the broadside ballads of the early nineteenth century as well, e.g. John Morgan, George Brown.
The first phase of the Yorkshire Garland project now has 88 recordings on the site, mostly of source singers, and some not available previously. Also like your collection, Jim, my recordings made in the East Riding with Jim Eldon are also at the BLSA, and a copy now in the VWML. If we can get further funding we hope to put some of the Hudleston recordings online as well.