Since Publication, more material has come to light which could have been included. One is from a little book Jule Medders described. It is long out of print but a reprint is available from Amazon (see Brown in the bibliography). Since the book is long in public domain, it would be nice to have it available in archive.org. I have compiled the material as addenda, which can be downloaded. No future edition is planned, but keeping this up now keeps ahead of the game, just in case, and allows readers to see how new material fits.