Correspondence, manuscripts, biographical and printed materials. The first series contains a small amount of personal and professional correspondence from the 1940s to 1970s, manuscripts of poetry and of theses and research papers from Berl's graduate studies at Leipzig and Columbia, biographical materials including photographs, reminiscences by and about Berl, and a few documents from his early years in Germany. The second and larger series includes papers which were posthumously arranged for publication by Susan Leibtag. The bulk of these writings are on topics related to psychology and social welfare, with a small number on philosophy and on Jewish identity as it relates to social work.