Barrel Polishing - written instructions

Does anybody know of written descriptions of all I need to know
about barrel polishing, in a book or pamphlet still in print?

Many thanks,
James Robinson

Judy Hoch - who also is an orchidean - as written a very good,
little book about mass finishing, which she presented me with when
she visited me about two years ago. It is very informative and I
think you can find answers to all (or most of) your questions about
barrel polishing in it. I have not got the book here, but I know that
Rio Grande sells it. Happy tumbling. Kind regards from Bornholm,
Denmark, where autumn finally gave us some rain. Niels Lovschal