Amazon France has a few copies left from this must have book on Bob de Moor: Bob de Moor. 40 ans de bandes dessinées, 35 ans aux côtés d’Hergé. It’s an excellent read and will give you a good view on what this artist has meant to the Hergé Studios. And although in French, the images will speak for themselves. Recommended reading although the prices are getting quite high (but expect them to rise even more in the next months as there will be a lot more attention for Bob de Moor).