Perry Douglas Erwin was a lieutenant in the 9th Field Artillery during World War I. The Erwin letters, dating January 1918 through January 1919, consist primarily of (173) letters from Erwin's wife, Vivian (living in Oswego, Kansas) to Erwin (stationed at Fort Still, Oklahoma and other locations); other correspondents include Erwin's sisters Harriet, Dorothy, and J.E.F.; Erwin's mother and father; Margaret Wyndham, a Henry Kendall College student-later-faculty member. There is also one letter from Erwin to his parents. (6) unidentified photos accompany Vivian Erwin's letter of 3 May 1918. Other non-correspondence includes a howitzer bag tag, a receipt for $45 stamped Boyd's Post Exchange Annex, a mimeograph copy of "Extract from Notes on Recent Military Operations (No. 2 G.H.Q. A.E.F.)", and cartoons and articles clipped from newspapers.