Great look into history.  Reims cathedral, Mortar Trench, tanks, bomb explosion, aviation, artillary near Lenoncourt, camouflaged Vienne-Le-chateau,vbrequet, lake Longemer American camp, U.S.S. Rumbler, big guns.  All thought to be authentic, two are a little lighter than the others.  On heavy thick paper/board.  The aviation camp Pic has tear at bottom left.  See all pictures for details.