The last time I reviewed Ashton's Real Sailor Songs I did find a Dibdin song or two. Most of these songs would be best described as "broadsides," song sheets that were sold to anyone wandering the streets of "sailortown." What was interesting to me was to see what some songs looked like before they were adopted by sailors and folk-processed. Ashton's book, original "working" copies as well as reprints are still available at Bookfinder.com for not unreasonable sums.