《中国图书馆分类法》第四版 (下称“第四版”)是众多专家在《中国图书馆图书分类法》第三版 (下称“第三版”)的基础上经过 9年的修订和审定而成的。在这次修订中 ,Ｒ类虽不是重点修订大类 ,但也有一定的增改。本次变动类目共计1382个。新增医学类目 18个 ,医学专类复分表 1个 The fourth edition of China Library Classification (hereinafter referred to as “the fourth edition”) is a large number of experts in the “Chinese Library Classification of Books,” the third edition (hereinafter referred to as the “third edition”) based on 9 years Revised and validated. In this revision, although R category is not the focus of major categories, but there are some changes. The total number of changes this time is 1382. There were 18 new medical categories and 1 medical category