Correspondence, minutes of meetings, financial records, publications, notes, subject files, awards, speeches, reports and audiovisual materials document work by the Church Peace Union, its successors Council on Religion in International Affairs and Council on Ethics and International Affairs, and related organizations such as the World Alliance for International Friendship Through the Churches. The first installment of the CCEIA archival materials came to the RBML in 1974, with numerous additions over the years. A major addition in 1982 contained primarily the records of the Board of Directors and their semi-annual meetings, as well as the various programs and institutes of the Council, for the years 1972-1982, along with selected 1930s materials. 1986 addition contains presidential correspondence files, minutes of the Board of Trustees and committees, special projects, programs and conferences files, and the business and editorial files of "Worldview". Correspondents include John Foster Dulles, Jane Addams, Fiorello La Guardia, and Paul Tillich. 1990 and 2000 additions includes files of CCEIA presidents and vice presidents, paper and audiovisual materials on Merrill House Conversation Programs; Educational programs; International Monetary Fund/Lecture series; The Annals Of The Academy Of Political & Social Science; Washington Consultations; Colloquia for the Clergy; Church State Project; Asian Development & The Carribean Initiative; Korea: Year 2000 Project; fundraising files, printed materials and files of the Department of Publications.

The Carnegie Endowment for International Peace established Le Centre Européen de la Dotation Carnegie pour la Paix Internationale in Paris as part of its Division of Intercourse and Education (Division des Relations et de L'Education) in 1912. The Centre was founded with an Advisory Council composed of representative and distinguished statesmen and public leaders of Europe and Asia. An Executive Committee was appointed from this Council with the authority to carry out the work of the Division abroad. The Centre Européen Records (1911-1940, 316 boxes) consist of correspondence; clippings; meeting minutes, agendas, and transcripts; lectures in typescript and printed form; memoranda; financial documents; books, pamphlets, speeches, reports, and brochures in typescripts and printed versions; invitations; maps; posters; architectural plans and drawings; and photographs, which document the founding, administration, and activity of the Centre Européen specifically and, in a more general sense, the work of the Carnegie Endowment in Europe.

Carnegie Endowment for International Peace, established by Andrew Carnegie in 1910, is a private, nonprofit organization dedicated to advancing cooperation between nations and promoting active international engagement by the United States. The files document the activities of the New York and Washington Offices of Carnegie Endowment for International Peace from 1910 until 1954, as well as the founding, administration, and activity of the Centre Europeen (CEIP Paris Office) and the work of the Carnegie Endowment in Europe in 1911-1940