Chiefly drafts and criticisms of the documents of the Second Vatican Council, with some related correspondence; schemata, circular letters, memoranda, interventions, and commentaries; handwritten, typewritten, mimeographed, photocopied and printed material.

Correspondence, financial and parish records, subject files, histories of the mission, printed material, and photographs. Principal correspondents include John Cardinal Cody of Chicago, Archbishop Marcos McGrath of Panama, and the priests of the mission and the Archdiocese of Chicago: Leo T. Mahon, Donald Headley, Frederick McTernan, John Enright, and John Greeley.