Q. Is there a chart or outline of Library of Congress call numbers?

The Library of Congress provides an outline of its classification system, which is used at the Thompson Library. Each class below is broken down into subclasses, e.g., Class Q (Science) contains subclasses Q (Science in general), QA (Mathematics), QB (Astronomy), QC (Physics), and so on. Click on any class to see its subclasses.

• A -- GENERAL WORKS
• B -- PHILOSOPHY. PSYCHOLOGY. RELIGION
• C -- AUXILIARY SCIENCES OF HISTORY
• D -- WORLD HISTORY AND HISTORY OF EUROPE, ASIA, AFRICA, AUSTRALIA, NEW ZEALAND, ETC.
• E -- HISTORY OF THE AMERICAS
• F -- HISTORY OF THE AMERICAS
• G -- GEOGRAPHY. ANTHROPOLOGY. RECREATION
• H -- SOCIAL SCIENCES
• J -- POLITICAL SCIENCE
• K -- LAW
• L -- EDUCATION
• M -- MUSIC AND BOOKS ON MUSIC  
• N -- FINE ARTS
• P -- LANGUAGE AND LITERATURE
• Q -- SCIENCE
• R -- MEDICINE
• S -- AGRICULTURE
• T -- TECHNOLOGY
• U -- MILITARY SCIENCE
• V -- NAVAL SCIENCE
• Z -- BIBLIOGRAPHY. LIBRARY SCIENCE. INFORMATION RESOURCES (GENERAL)

Related FAQ: How do I find a call number in the library?