《中国图书馆图书分类法》第三版(简称《中图法》第三版)经过数年的努力,1990年终于完成修订和出版工作,并将作为国家标准颁布。第三版较第二版有较大的改进。增加了大量新学科类目,许多类作了细分,调整了不合理类目,订正了类名,增加了注释和组配。其科学性、实用性进一步提高。为了使用单位工作的连续性和稳定性,避免更多的麻烦,三版在原有体系结构和标记制度基本不变的基础上加以完善、充实、提高。大改大动的类目相对来说份量不 After several years of efforts, the third edition of the “Library Classification of Library Classification of China” (referred to as “the third edition of the Chinese Library Classification Law”) was finally revised and published in 1990 and will be promulgated as a national standard. The third edition has a bigger improvement than the second edition. A large number of new subject categories have been added, many of which have been subdivided, adjusted for unreasonable categories, revised class names, added annotations and groupings. Its scientific and practical to further improve. In order to use the continuity and stability of the work of the unit and to avoid more troubles, the third edition should be perfected, enriched and improved on the basis of the basically unchanged system and marking system. Large changes in the category of moving relative weight is not