Tuthill continued his interest in foreign affairs by leading various international organizations and seminars. He was the Director of the Atlantic Institute, President of the Salzburg Seminar, and Director of the American Foundation. He was involved in other international organizations and foreign affairs during this time.

Correspondence, reception guest list, invitations, and brochures while Tuthill was Director of Atlantic Institute; 1975

Correspondence and reports re: Salzburg Seminar; 1977.

Correspondence regarding the Salzburg Seminar in American Studies.  Includes a project proposal by Sigmund Cohen entitled "Atlantic Relations Clearing House."

Correspondence with Tuthill and John Anderson; Woodrow Wilson Foundation; Salzburg Seminar; 1978

Correspondence and report re: Cosmos Club, Salzburg Seminar, British-North American Committee, and Harvard University; 1979

Bylaws and Articles of Incorporation of Salzburg Seminar while Tuthill is President of the organization; 1979

Tuthill’s participation as the Woodrow Wilson Visiting Fellow; brochure from Transylvannia University; 1979

Correspondence with Tuthill and notes from a meeting of the Business Advisory Council while Tuthill president of Salzburg Seminar; Jan.-Mar. 1980

Correspondence with Tuthill while president of Salzburg Seminar; includes Letter to Warren E. Burger; April-June 1980

Correspondence with Tuthill while president of Salzburg Sem.; July-Oct 1980