World War I -- novels

I would like to call upon the assistance of the collective brain. For the library, I'm compiling a list of novels set during (or remembering) World War I. What follows is the list I have so far. The ones with an asterisk are ones that I haven't yet read, so any thoughts about them would be much appreciated. The library usually leans toward newer books in their booklists, but I may be able to slip in some classics also. If you can think of any other books which should be on this list, I would be very grateful for suggestions. Thank you!

Patricia Anthony. Flanders (1998)
Pat Barker. Regeneration trilogy: Regeneration, The Eye in the Door, The Ghost Road
Marc Dugain. The Officers' Ward (2000)
Sebastian Faulks. Birdsong (1993)
Alan Fisher. The Rage of Angels
Charles Yale Harrison. Generals Die in Bed
*Mark Helprin. A Soldier of the Great War
Susan Hill. Strange Meeting (1971) note: this is a beautiful book; I recommend it highly.
*Guy Johnson. Standing on the Scratch Line
*Iain Lawrence. Lord of the Nutcracker Men (2001) --YA
*Richard Marius. After the War (1992)
Linda Newbery. The Shell House (2002) -- YA; contemporary setting but with WWI theme
*Anne Perry. No Graves as Yet
Erich Maria Remarque. All Quiet on the Western Front
Charles Todd. Inspector Ian Rutledge mysteries: A Test of Wills, Wings of Fire etc.
*Tom Willard. The Sable Doughboys
Jacqueline Winspear. Maisie Dobbs (2003)

note:YA=young adult