Have you looked at RVW's notebooks? You can also use the Bodleian Broadsides online collection for words (which is pretty much what he intended - rarely wrote down words believing that they could be found on broadsides) The other useful tool is the Roud index which is available on the EFDSS website and will allow you to locate other versions of the songs.So, for example, 'Near Scarborough Town' is Roud 185 which is a version of 'Stowe Brow' or 'The Drowned Lover' . There are versions from all over UK as well as Newfoundland. If RVW did not write the words down then you're not going to get his exact version. I've worked extensively with his notes over the past seven years and share the frustrations that you probably feel.