It was the Monogram book, and the '0 nine' I was referring to in my original reply. The Monogram Painting Guide is still generally regarded as the 'standard' - the text might now be slightly out-dated, due to more recent research and discoveries, but there's no getting away from the value of the colour chips.
I paid, I think, £40 for my copy, second hand, in excellent condition, around 25 years ago ( a lot of money then), only to 'lose' it after lending to a friend, who moved house and we lost touch! B*gg*r !!