The papers represent the scope of Brainin's life endeavours as writer, editor, biographer, critic, translator, lecturer, Zionist and one of the founders of the Jewish Public Library. The Fonds is divided into five major series: Literary and editorial activities (Gr. I), Biography and criticism (Gr. II), Correspondence (Gr. III), Special Collections (Gr. IV), and the records of the Jewish Public Library Archives Committee (Gr. V). Each group is further divided by subseries. In addition to this groups, the fonds also includes approximately fifty photographs, all arranged and described in the JPL Photograph Database.