These papers, presented before The Library Institute of the University of Chicago in 1942 constitute between covers a unique one volume criteria -- material hitherto scattered through periodicals and in scholarly treatises. Reference work is too often known only to those who use the library for that purpose, and to the librarians themselves. This should be of tremendous help in both categories. Organization and administration problems, varying procedures, specialized collection problems, training of personnel, book selection for reference work -- all these topics are given due emphasis by specialists. Here is a book which all ""friends of libraries"" should study.