Correspondence, tributes, printed and draft articles and notes, and genealogies and other family papers. Subjects include Willcox's involvement in the United States census of 1900, the International Statistical Institute, Amherst College alumni activity, and statistical analysis of various social problems, including the registration of births and deaths and voter registration, Afro-American crime statistics, race relations, and Prohibition.

The collection also includes tape recordings celebrating Willcox's 90th, 95th, and 100th birthdays; family correspondence, including letters to and from Alice Eloise Work (Mrs. Walter Willcox), and his son Bertram F. who was in France with the American Ambulance Field Service.

Also, material relating to his work with the William Allen White Committee to Defend America by Aiding the Allies, comment on American political practices and statecraft, addresses and articles pertaining to Cornell University, and work concerning Congressional reapportionment. Tape recordings pertain to Andrew Dickson White, Jacob Gould Schurman, and Charles Kendall Adams.

Collection of anecdotes concerning various members of the Cornell University faculty and administrators, collected by Willcox for use by the Cornell Alumni News.

90th Birthday Dinner address, "The Disunited Nations: A Novel Experiment in the Balance of Power," and cover letter, April 2, 1951.

Memo by Loren Petry on the origin of the Willcox-Becker Luncheon Club (sometimes called the Thursday Luncheon Club), and comments by Walter Willcox on the club, plus his memories of his years (1899-1901) as chief statistician of the 12 U.S. Census. There is also an interesting reference to Edmund Ezra Day and freedom of speech.