This is a preliminary digitization of S.R. Ranganathan's Prolegomena to Library Classification (Assisted by M.A. Gopinath). Published by Asia Publishing House (New York), 1967 (printed in India). Copyright permissions granted from the copyright holder: Sarada Ranganathan Endowment for Library Science (SRELS). To purchase reprints of this work, please visit Ess Ess Publications at http://www.essessreference.com/. Table of Contents: Part A: Introduction includes Preface to Edition 1 by Sayers, Genesis of Edition 1 (1937), Development of Edition 2 (1957), Development of Edition 3 (1967), Features of Edition 3 (1967); Part B: Summary of Normative Principles; Part C: Basic Concepts and Terminology of Classification; Part D: Normative Principles; Part E: Canons for Work in the Idea Plane; Part F: Principles for Helpful Sequence; Part G: Canons for Work in the Verbal Plane; Part H: Notational Plane; Part J: Canons for Work in the Notational Plane; Part K: Canons for Mnemonics; Part I: Notational System for a Growing Universe; Part M: Planes of Work; Part N: Foci in an Array; Part P: Formation, Structure, and Development of Subjects; Part Q: Classification as Transformation; Part R: Analytico-Synthetic Classification (Idea Plane); Part S: Analytico-Synthetic Classification (Notational Plane); Part T: Quasi-Subject and Subject Bundle; Part U: Book Number; Part V: Use of Collection Number; Part W: Universal & Special Classification; Part X: Reflections; Bibliographical References; Index.