The collection of Delachaux essential part of what is best in terms of quality / price ratio. The photos are beautiful, everything is detailed to not spend hours searching what was before his eyes. And I do not think I am right in saying that it is the objective of every person interested in this kind of work. I comment on this book one, but believe me, that you are interested fungi, trees, birds, etc., do not hesitate to invest in this collection. As the previous comment, they really are books that are made to be carried away trips, they are plasticized, are small (I myself take several outputs to each of my kind) ... In short You will understand, to me that's really the collection to have in his library. You can go there with closed eyes.