Centennial: Rare Photos from 1917-1918 Show American Troops in World War I

In the wake of the appearance of a new World War I book marking the centennial of the United States entry in the European conflict, the Bruno Cabanes book Les Américains dans la Grande Guerre (The American People in the Great War), Géo Magazine presents a dozen of the book's rarely seen 145 photographs.

Note: if you squint just right, you should be able to make your eyes superimpose the two parts of the second photograph below in just the right way — remember the View-Master as well as Magic Eye's 3-D party books from the 1990s? — in order to make it into a three-dimensional picture.