United States. Army. American Expeditionary Forces -- History -- World War, 1914-1918
in subject[X] World War, 1914-1918 -- Aerial operations
in subject[X] World War, 1914-1918 -- France
in subject[X] Correspondence
in subject[X] Welty, Clair Wilbur, 1890-1918
in subject[X]