Primary sources are the prerequisite for exploring the history of science and technology in pre-modern China.How can the valuable ones be winnowed out from the vast landscape of historical materials?
Books predominate among Chinese historical sources.Guji古籍,or pre-modern Chinese books are generally defined as pre-1912 printed books and manuscripts,often bound in the characteristic traditional Chinese way.The General Catalogue of Pre-modern Chinese Books (Zhongguo guji zongmu 中国古籍总目) encompasses around 200,000 titles,and is estimated to cover more than 500,000 editions(Compilation Committee 2012,"Preface," 3).From at least the 1980s,almost all the printed books and manuscripts prior to the year of 1796 were categorized as rare books.2 The Union Catalogue of Rare Books in China (Zhongguo guji shanben shumu国古籍善本书目) contains approximately 74,000 editions (Editorial Committee 1989-1998).