Researching this subject I came across a wide range of books - some good, some bad, and many that were useful in providing some hard-to-find information. Here is a selection...
Established on-line bookshops offer significant discounts, and we receive a small commission on all purchases made when (but only when) you start shopping from here.
Alternatively, any good book store can also supply these books.
Text © 2006 Joules & Ken Taylor
Book illustrations courtesy of Amazon