In 2002 D.J. Johnston completed his Master's thesis at the University of Glasgow. He has given us permission to include the link for download. It runs about 100+ pages including pictures and graphics. It makes a very interesting read. D.J. says there are places he would like to edit, but this was his 2002 effort. Enjoy! You will find the link under our Useful Links: Books
https://www.clanmacfarlane.org/public_html/index.php/useful-links/70-books.html