Thanks so much to everyone for quite a feast of suggestions to explore, and so quickly! I knew I'd get some good ideas from you. Once I've worked out what I want to do, I'll describe it in enough detail to (I hope) make it useful to others. First, though, I need to wade back through the published sources to get a good handle on where I think the weak and strong links are in each of the two lineages being argued as being The Truth. Before I wade in too far, I need to be certain that one of the two doesn't emerge as an obvious winner-in which case, my problem would be largely solved. Upward and onward! Bobbie