Book classification
All books are divided into 7 grades, basically divided into 5 grades, as common sense. All central colleges, comprehensive branches, professional libraries and subject reference rooms can use this classification level method to classify books.
The first level is divided into humanities books and nature books according to the attributes of the universe.
The second level is divided according to the basic subject attributes of books.
Basic humanities subjects: philosophy A, religion B, ethics C, logic D, aesthetics E, psychology F, language G, literature H, art I, politics J, economy K, military L, law M, education N, sports O, media P, information Q, management R, business S, history T, archaeology U, nationality V, life W, wealth X.
Natural basic disciplines: A astronomy, B geography, C mathematics, D physics, E chemistry, F biology, G machinery, H telecommunications, I water conservancy, J electric power, K textile, L food, M architecture, N mine, O metallurgy, P energy, Q transportation, R aerospace, S medicine, T engineering, U agriculture, V forestry, W aquaculture, X computer.
The third level is divided according to the standards of books affiliated disciplines.
The fourth level is divided by the functional attributes of books.
The fifth level divides books into works, academics, teaching and help according to their attributes.
The sixth level is divided into domestic and foreign original books according to the international space of books.
The seventh floor is divided according to the chronological order of books.