Not so many nowadays, I suspect. I've seen the copy at the VWML and have photocopies of John Barleycorn, Go From My Window, A Jug of This and Banks of Sweet Primroses ("Penguin" related material, you see) and most of these were the earliest examples taken from oral currency in England with their tunes.

Very hard to get copies; I'm still looking. Also interesting and rather on the same lines are M H Mason's Nursery Rhymes and Country Songs (1910?) and A E Gillington's Songs of the Open Road (1911)- both also hard to find. I covet them all, of course.