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What does S stand for in the professional retrieval of Guizhou Digital Library?
Agricultural science.

Marxism, Leninism and Mao Zedong.

Thought, Deng Xiaoping Theory; Philosophy and religion; Introduction to social science; D. politics and law; E military; F economy; G. culture, science, education and sports; H. language and writing; First, literature; J art; History and geography. Introduction to natural science; Mathematical science and chemistry; P astronomy, earth science; Biological sciences; R. medicine and health; Agricultural science; T industrial technology; U transportation; V aviation and aerospace; X environmental science and labor protection science (safety science); Z comprehensive books.