1, Marxism-Leninism, Mao Zedong Thought, Deng Xiaoping Theory?

2. Philosophy and religion?

3. Introduction to Social Science?

4. politics and law?

5. Military?

6. Economy

7. Culture, science, education and sports?

8. Language and literature?

9. Literature

10, art?

1 1, history, geography?

12, natural science?

13, Mathematical Science and Chemistry?

14, astronomy, earth science?

15, biological science?

16, medicine, health?

17, agricultural science?

18, industrial technology?

19, traffic?

20. aerospace

2 1, environmental science, safety science?

22. Comprehensive books

Book classification, also called book classification thesaurus, is classified according to the contents, forms, genres and readers' uses. Under the guidance of certain philosophical thoughts, it uses the principle of knowledge classification and adopts logical methods to divide books of various disciplines into several categories according to their subject contents.

Each category is divided into many subclasses, and each subclass is divided into molecular subclasses. Finally, every kind of book can be divided into certain categories, and each category has a category number. ?

Extended data:

First, the composition of books.

1, there must be knowledge and information spread.

2. There should be text and image signals to record knowledge.

3. There should be a material carrier for recording text and image signals.

4. The production technology and craft of books are also the basic conditions for producing books.

Second, the characteristics of books

1, the content is systematic, comprehensive, mature and reliable;

2. The publishing cycle is long and the information transmission speed is slow.

Third, the development of books.

The operating benefit of China book industry is relatively stable, with gross profit margin ranging from 15% to 16% and sales profit margin ranging from 12% to 14%. However, compared with other industries, the return on investment in this industry is not ideal, with the return on total assets less than 6% and the return on net assets less than 8%. Fortunately, these two indicators are fluctuating and rising.

According to statistics, after a slight decline in 2009, the sales scale of China book industry returned to double-digit growth rate in 20 10, and the industry sales revenue reached 67.293 billion yuan. At the same time, the industry profit reached 365,438+77 million yuan, a year-on-year increase of 43.7438+0%.