Ross is correct about the the 1986 book, and the colours. There is one for 1994 and 2000 also, but the 1986 is the one I use most. There's also Kosta 250 Years, which gives an overview of the history of the companies. It's a decent book, but not that useful practically speaking. There isn't a book that explains the coding system.
Vallien would say his allegiance was to Afors, a company that was taken over by Boda. He insisted on the factory remaining open. More importantly, he ensured the factory would successful by continuing to design production pieces when he could have made enough income deigning only his high-priced individual pieces. He's very much an artist with a social conscience.