What kind of book does A.B.F.O.H stand for?

I Marxism-Leninism, Mao Zedong Thought and Deng Xiaoping Theory.

b？ Philosophy, religion

f？ economy

o？ Mathematical science and chemistry

h？ Language, writing

According to the contents, forms, genres and readers' usage of books, under the guidance of certain philosophical thoughts, books in various disciplines are divided into several categories according to their subject contents by using the principle of knowledge classification and the logical method, and each category is divided into many subcategories, and each subcategory is subdivided into molecular subcategories.

Finally, every kind of book can be divided into certain categories, and each category has a category number. Classified thesaurus is a collection of hierarchical classification numbers and categories.

Extended data:

Others:

Me? literature

j？ art

k？ History, geography

n？ Introduction to natural science

o？ Mathematical science and chemistry

P astronomy, earth science

q？ Biological Science

r？ Medicine and health

s？ agro-science

t？ technology