Classification

Chinese Library Classification - Wikipedia

A Marxism, Leninism, Maoism and Deng Xiaoping Theory
B Philosophy and Religions
C Social Sciences
D Politics and Law
E Military Science
F Economics
G Culture, Science, Education and Sports
H Languages and Linguistics
I Literature
J Art
K History and Geography
N Natural Science
O Mathematics, Physics and Chemistry
P Astronomy and Geoscience
Q Life Sciences
R Medicine and Health Sciences
S Agricultural Science
T Industrial Technology
U Transportation
V Aviation and Aerospace
X Environmental Science
Z General Works

English

• H31 英语
  • H310.1 非标准英语 Non-standard English
  • H310.4 英语水平考试 English proficiency tests
  • H310.9 英语发展史 History of English development
  • H311 语音 Phonetics
  • H312 文字 Orthography
  • H313 语义、词汇、词义 Semantics, vocabulary, and word meaning
  • H314 语法 Grammar
  • H315 写作、修辞 Writing and rhetoric
  • H315.9 翻译 Translation
  • H316 词典 Dictionaries
  • H317 方言 Dialects
  • H319 语文教学 Language teaching
• Custom
  1. English Guide
  2. Listening
  3. Pronunciation
  4. Speaking
  5. Grammar
  6. Reading
  7. Vocabulary
  8. Writing
  9. Comprehensive

Mathematical

• O1 数学 Mathematical
  • O1-0 数学理论 Mathematical theory
  • O1-6 数学参考工具书 Mathematical reference books
  • O1-8 计算工具 Computational tools
  • O11 古典数学 Classical mathematics
  • O119 中国数学 Chinese mathematics
  • O12 初等数学 Elementary mathematics
  • O13 高等数学 Higher mathematics
  • O14 数理逻辑、数学基础 Mathematical logic and foundations
  • O15 代数、数论、组合理论 Algebra, number theory, and combinatorics
  • O17 数学分析 Mathematical analysis
  • O18 几何、拓扑 Geometry and topology
  • O19 动力系统理论 Dynamical systems theory
  • O21 概率论与数理统计 Probability theory and mathematical statistics
  • O22 运筹学 Operations research
  • O23 控制论、信息论（数学理论） Control theory and information theory (mathematical theory)
  • O24 计算数学 Computational mathematics
  • O29 应用数学 Applied mathematics

CS

• CSDIY
  1. Guideline
  2. Productivity Toolkit
  3. Fundamental Programming
  4. Fundamental Electronics
  5. Data Structures and Algorithms
  6. Software Engineering
  7. Computer Systems Principles
  8. Computer Architecture
  9. Operating Systems
  10. Distributed Systems
  11. Computer Security
  12. Computer Networking
  13. Database Systems
  14. Compilers
  15. Programming Language Design and Analysis
  16. Computer Graphics
  17. Web Development
  18. Data Science
  19. Artificial Intelligence
  20. Machine Learning
  21. Machine Learning Systems
  22. Deep Learning
  23. Advanced Machine Learning