UDC简表(-) Main tables *0 Generalities x 01 Bibliography and bibliographies. Catalogues *02 Librarianship *030 General reference works. Encyclopaedias Dictionaries * 1 Philosophy x 11 Metaphysics. Fundamental problems x 3 Social sciencesUDC简表（一） Main tables  0 Generalities  01 Bibliography and bibliographies. Catalogues  02 Librarianship  030 General reference works. Encyclopaedias. Dictionaries  1 Philosophy  11 Metaphysics. Fundamental problems  3 Social sciences