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In this Dec. 5, 2011 file photo, Arnold Greissle-Schoenberg looks at a display about his grandfather, 20th century composer Arnold Schoenberg, during a tour of the University of North Texas Music Library in Denton, Texas. (AP Photo/LM Otero)
A sculpture by German artist Kaethe Kollwitz, titled "The Mourning Parents" at the World War I Vladslo German Cemetery in Vladslo, Belgium. The German artist Kaethe Kollwitz turned out a series of deathly woodcuts, posters and sculptures surrounding the tragedy of war, including "The Mourning Parents", which serves as a memorial to her son Peter who was killed in World War I. (AP Photo/Virginia Mayo)
A visitor stands in front of the water color "War wounded" (1922) at the exhibition "The War" (Der Krieg) by German painter Otto Dix in Dresden, Germany. Dix was profoundly affected by the World War 1 and much of his work reflects the horrors. (AP Photo/Jens Meyer)
Sir Arthur Conan Doyle's passport dating from World War I on display at Christie's auction house in London. The passport and some 3,000 other items were among Doyle's lost papers that were found in a London law firm's archive where they were stored and forgotten after they were taken from Doyle's writing desk in 1930, following his death. Arthur Conan Doyle met with troops in the spring of 1916 and completed his work "A Visit To Three Fronts" over the summer. (AP Photo/Alastair Grant)
A visitor looks at a photo of a graveyard of fallen soldiers during an exhibition of World War I objects at the German Historical Museum in Berlin. At left, is the painting "Armistice Day 1918" by U.S. artist Gifford Beal and at right the painting "Insurrection" by German artist Hans Richter. (AP Photo/Markus Schreiber)
In this undated file photo American writer and poet Carl Sandburg poses for a photo. Poets and writers on both sides of the Atlantic at first cheered on the battles of World War I. Carl Sandburg's "Four Brothers" hailed the "Ballplayers, lumberjacks, ironworkers, ready in khaki/A million, ten million, singing, 'I am ready.' " (AP Photo)
A reproduction of James Montgomery Flagg's Uncle Sam recruitment poster from 1917 is displayed as part of the exhibition "Between the Lines and Trenches", at the Museum of Letters and Manuscripts in Paris. Flagg was asked, during World War I, by the U.S. government to create a poster that would encourage young people to join the military. (AP Photo/Thibault Camus)