With family and friends, traveling, 1921

Correspondence in the series describes Mills' travels, activities, and opinions, including those about art and literature, cultural and social issues surrounding World War I and II, Chinese-American relations, and the impact of Communism and Communist thought on East Asian nations. Correspondents of note include Carson McCullers; her brother DeLong Mills on active duty with the U.S. Navy during World War II; Annabel P'u, wife to the younger brother of China's last emperor; and other Chinese and American officials. The series consists primarily of letters, with some cards, photographs, and articles, clippings, and pamphlets that have been included by correspondents. Materials in this series encompass the years 1915-1986.

For correspondence pertaining to life at St. Agatha School, Wellesley College, and the Army School of Nursing at Camp Meade, see series II. Education. For correspondence with Wellesley College classmates regarding reunions and similar activities, see series II. Education. For letters to newspaper editors regarding China and correspondence with American and Chinese officials regarding China and Chinese diplomacy, see IV. Chinese Activism and Philanthropy > E. Correspondence. For correspondence with Madame Chaing Kai-shek (nee May-ling Soong), see series V. May-ling Soong Chiang.