PART 1. PRINCIPLES, FORM, AND STRUCTURE. 1. INTRODUCTION -- 2. BASIC PRINCIPLES. 3. FORMS OF HEADINGS. 4. SUBDIVISIONS. 5. CROSS-REFERENCES. 6. PROPER NAMES IN SUBJECT HEADINGS. 7. SUBJECT HEADINGS CONTROL AND MAINTENANCE. -- PART 2. APPLICATION. 8. SUBJECT CATALOGING. 9. SUBJECT CATALOGING OF SPECIAL TYPES OF MATERIALS. 10. SUBJECT AREAS REQUIRING SPECIAL TREATMENT. Literature -- Music -- Art -- Religion -- Law -- Source Materials in the Fields of History and Genealogy -- Archaeological Works -- Area Studies and Research -- Zoological Works -- References -- PART 3. LIBRARY OF CONGRESS SUBJECT HEADINGS IN THE ONLINE ENVIRONMENT. 11. LIBRARY OF CONGRESS SUBJECT HEADINGS AS AN ONLINE RETRIEVAL TOOL. 12 FUTURE PROSPECTS -- APPENDIXES. Appendix A. GLOSSARY -- Appendix B. AUXILIARY PUBLICATIONS OF LIBRARY OF CONGRESS SUBJECT HEADINGS -- Appendix C. FREE-FLOATING FORM AND TOPICAL SUBDIVISIONS -- Appendix D. FREE-FLOATING FORM AND TOPICAL SUBDIVISIONS CONTROLLED BY PATTERN HEADINGS -- Appendix E. SUBDIVISIONS TO BE FURTHER SUBDIVIDED BY PLACE -- Appendix F. FREE-FLOATING SUBDIVISIONS USED UNDER NAMES OF PERSONS -- Appendix G. FREE-FLOATING SUBDIVISIONS USED UNDER NAMES OF PLACES -- Appendix H. PATTERNS OF CROSS-REFERENCES FOR PROPER NAMES -- Appendix I. AUTHORITIES USED IN ESTABLISHING HEADINGS -- Appendix J. FIRST-ORDER POLITICAL DIVISIONS OF THE EXCEPTIONAL COUNTRIES -- Appendix K. MARC CODING FOR SUBJECT INFORMATION -- Appendix L. ABBREVIATIONS -- Appendix M. CAPITALIZATION -- Appendix N. PUNCTUATION.