Hi Leni
In my opinion no-one can have too many paperweight reference books! I don't think Bob will be at Gaydon, as he is not very well. Sweetbriar may have the books, but it is worth checking via the link I posted what the cheapest second hand price is.
Regarding Dave Webber's article (The Evolution of Scottish Paperweight Makers), it was first in the PCA 2000 Bulletin, then appeared updated in the 2003 Bulletin.
Regards
Alan