The following gives an outline of the main subject divisions of the Library of Congress Classification.  

• A -- GENERAL WORKS
• B -- PHILOSOPHY. PSYCHOLOGY. RELIGION
• C -- AUXILIARY SCIENCES OF HISTORY (ARCHAEOLOGY, GENEALOGY, BIOGRAPHY)
• D -- HISTORY: GENERAL, EUROPE, ASIA, AFRICA, OCEANIA

• DS – History of Asia

• DS701-799 – History of China

• DS796.H7 – History of Hong Kong

• E – F -- HISTORY: AMERICA, WESTERN HEMISPHERE
• G -- GEOGRAPHY. ANTHROPOLOGY. RECREATION
• H -- SOCIAL SCIENCES

• HA Statistics

• HB Economics

• HC426-430 Economic Conditions – China

• HC470.3 Economic Conditions – Hong Kong

• HD Industries, Industrial Management, Industrial Relations

• HF Accounting, Commerce, Business, Marketing, Personnel Management

• HG Finance, Banking

• HJ  Public Finance

• J -- POLITICAL SCIENCE
• K -- LAW

• KNR -- Law of Hong Kong

• L -- EDUCATION

• LG51-53 Education (by Individual Institutions: China, including Hong Kong)

• M -- MUSIC AND BOOKS ON MUSIC
• N -- FINE ARTS
• P -- LANGUAGE AND LITERATURE

• PE English Language

• PR English Literature

• PS American Literature

• PL1001-3208 – Chinese Language, Chinese Literature

• Q -- SCIENCE
• R -- MEDICINE
• S -- AGRICULTURE
• T -- TECHNOLOGY

• TK5105 Computer Networks

•  -- MILITARY SCIENCE
• V -- NAVAL SCIENCE
• Z -- BIBLIOGRAPHY. LIBRARY SCIENCE. INFORMATION RESOURCES (GENERAL)