Foreword, by V. W. Clapp.--A bibliography of Jesse Hauk Shera, by G. M. Isard (p. [11]-40)--Introduction, by C. H. Rawlski.--The pertinence of history: The research and writing of library history, by S. Ditzion. Growth patterns of public libraries, by D. M. Sinclair. Origins of the Mouselon of Alexandria, by H. J. de Vleeschauwer and H. C. Wright.--Basic issues: The interdisciplinarity of librarianship, by C. H. Rawski. The nature of information science, by B. C. Vickery. The contribution of classification to a theory of librarianship, by D. J. Foskett. Referential consulting networks, by M. Kochen. The world encyclopedia concept, by G. Harmon.--Information retrieval: On information retrieval systems, by W. Goffman. On a fallacy in the use of computing machines for automated dictionary retrieval, by A. D. Booth. Browsing and search theory, by P. M. Morse. The symmetries of ignorance, by R. A. Fairthorne. A thesaurus within a thesaurus: a study in ambiguity, by P. A. Richmond.--Catalog topics: When is a subject not a subject? By J. Metcalfe. From pig to man, by P. S. Dunkin. Books catalogs, by M.F. Tauber and H. Feinberg.--Contexts: Historiographs, librarianship, and the history of science, by E. Garfield. Informal communication in science: its advantages and its formal analogues, by H. Menzel. Writing systems: a datum in bibliographical description, by J. Mountford.--Forecast: Innovation in libraries: effect on function and organization, by R. S. Taylor.