Correspondence, speeches, internal memoranda, and printed material document the work and travels on behalf of the Endowment of the Baron d'Estournelles de Constant (the Centre's President, 1913-1924), Earle Babcock and Malcolm Davis (its two American Directeur-Adjoints), and Nicholas Murrary Butler (the Director of the Division of Intercourse and Education). Babock's and Davis's files include separate groups of correspondence with Butler and Henry Haskell, who was Butler's assistant. The series also include books and pamphlets by an about Andrew Carnegie and some correspondence with Louise Carnegie.