The Council for the Clinical Training of Theological Students (CCTTS) was founded in 1925 by Anton T. Boisen. In later years, Dr. Helen Flanders Dunbar became the organization's Medical Director and Henry Pitney Van Dusen became a member of the CCTTS board of governors. The records reflect the development of the concept for CCTTS from Anton Boisen's initial proposal through the project's early activities in lively "Hospital Pictorials" to more formal administrative documents of the incorporated organization and the spread of the program to other hospitals and areas. The collection also contains some typescript writings by Anton Boisen and CCTTS board correspondence from Henry Pitney Van Dusen.

Correspondence, 1931-1974; material related to World Council of Churches, Presbyterian Board of Foreign Missions, and American Association of Theological Schools; articles; manuscripts of books; notebooks; and newspaper clippings.

Reverend Paul Edwin Spiecker was a Union Theological Seminary student and Methodist minister, and Pastor of Trinity Church in Stony Point, NY. The collection contains manuscript and typescript notes for term papers and lectures at Union Theological Seminary, as well as booklets from the NJ Temperance Society, The Scientific Temperance Federation Bulletin from 1938, and a booklet on "Alcohol Problems Visualized" published by the National Forum.

The Theological Discussion Group, meeting twice yearly in weekend retreat initially at Yale University, included Reinhold Niebuhr, Richard Niebuhr, Paul Tillich, Henry Van Dusen, James Luther Adams, Georgia Harkness and many other leading Christian thinkers. Papers were presented and critiqued, and issues concerning the evolution of Christianity and the modern world discussed. The collection contains typescript addresses presented to the Theological Discussion Group, as well as a small amount of administrative correspondence, including lists of members.

The William Adams Brown Ecumenical Library (WAB) was founded by the Union Theological Seminary (UTS) Board of Directors as a response to the increasing demand for materials in the field of ecumenicity. The collection contains general information and material relating to ecumenism, Henry Pitney Van Dusen, and the William Adams Brown Ecumenical Library, including papers, notes, clippings, and correspondence.