> Unfortunately Slack's book is long out of print 
> (even though it is still listed in "Books in Print"),
>  and I think Schnell's book might also be. 
There was a bookseller in Florida who had copies of Schnell's 
book for $15 some months ago. I still have his address (at home) 
and I can dig it up and post it to the list if there is interest. 
Let me know.
Phil
(pjs20347@glaxo.com or bonz@nando.net)