For a number of years I used to go to the nearby Champagne Ardennes region for a weekend in summer with a bunch of friends. On a few occassions we visited the Chemin des Dames battlefields, and I picked up the books in the picture.
One local guide, with a cover by Tardi, the French comic artist who has had a great impact on the way we see WWI. And another a more extensive account of the many battles fought on the Chemin des Dames, starting with the 1814 battle of Craonne (Napoleon's Last Victory), the 1914 battles, the disastrous 1917 offensive and the German offensive of 1918.
Added are two monographies: Pyrrhic Victory by Robert Doughty on the French Army in WWI and Pierre Miquel's book on the Chemin des Dames. And finally an issue of the French WWI magazine Tranchées, dealing with the offensive with limited objectives, among which the capture of Fort Malmaison on the Chemin des Dames in October 1917.
So Michiel is well prepared for his holiday.
Michiel bought me a Dutch translation of Albert Nofi's book on Waterloo for my birthday. An interesting take, you can spot the wargamer from miles away.