Murray on Saltspings' massive collection of Scottish ones is already in DT. Search DT for 'MS', also search on 'WBO' as some of his are mistakenly attributed to me. Another good source is J. O. Halliwell's 'The Nursery Rhymes of England', several editions, (one reprinted) and not all the same. Many are rare ones not in the Mother Goose type of collections.