Introduction

In the summer of 2021 we began thinking about producing a series of printed volumes in which to publish our research. Quite a lot of our work had already been printed in the several books we had published and also in our  issues of The Bulletin produced twice each year (for members only). Articles in The Bulletin are of necessity not very long, whereas the envisaged volumes would permit much more extensive studies. Another aim of the volumes was to provide a more permanent home for the material already on our website, since the durability of websites managed by small organizations is not very reliable.