Roy Palmer has been responsible for a large number of song books. I have more than a dozen. Some are still in print, probably all of them can be found on the internet. They were done on themes, so none is likely to be just the usual collection, and you ought to be able to find something there. Another good source is other people's recordings. I've heard many a good song that way, and then had the fun of tracking the words down so I could learn it.