What is the classification standard of books? And what are the sub-categories under the big category?

Ketu method and China Library Classification are commonly used book classifications, Ketu method refers to the library classification of China Academy of Sciences, and China Library Classification refers to the library classification of China.

Brief Introduction of China Library Classification

China Library Classification (CLC) is a comprehensive classification widely used by libraries and intelligence agencies in China. By 1999, China Library Classification has been revised four times (focusing on F economy, TN radio electronics, telecommunications technology, TP automation technology and computer technology). ?

China Library Classification is divided into 5 basic categories and 22 major categories. Chinese phonetic alphabet and Arabic numerals are mixed, one letter represents a big category, and the alphabetical order reflects the order of big categories, and the number after the letter is used as a mark. In order to adapt to the development of industrial technology and the classification of this kind of literature, the two-letter classification of industrial technology is adopted.

The category names of China Library Classification are as follows:

Marxism-Leninism and Mao Zedong Thought.

I Marxism-Leninism and Mao Zedong Thought.

philosophy

social science

C introduction to social science?

D politics and law?

natural science

Introduction to natural science?

O mathematical science and chemistry?

P astronomy, earth science?

Q biological science?

R medicine, health?

Agricultural science?

T industrial technology?

U traffic?

5. Aerospace?

X. Environmental Science and Labor Protection Science

Comprehensive books

Z comprehensive books

Brief Table of China Library Classification

Brief Introduction of Library Classification of China Academy of Sciences

Like China Library Classification, Ancient Map Law divides knowledge into five categories, but on the basis of these five basic categories, 25 basic categories are formed. The classification numbers of categories at all levels adopt a simple Arabic numeral system without any basic symbols, which is simple, concise, easy to write and remember. The number is divided into two parts. The first part adopts the sequential system, and 25 categories and their main categories are allocated from 00 to 99. The second part adopts decimal system to accommodate the subdivided categories: in the number compilation technology, the two-digit method, the borrowing method and the alternating method are adopted to make the number allocation flexible.

The name of Ketu Legal Department is as follows:

00 Marxism-Leninism and Mao Zedong Thought.

10 philosophy

20 social sciences

2 1 history

27 economics, economics

3 1 Political and social life

34 Law and Jurisprudence

36 military, military science

Culture, science and education

4 1 Linguistics

42 literature