Producers of printed indexes to the serial literature are also making information available in a machine-readable form. 期刊文献印刷本索引的编制者也在以机读形式提供情报。
For centuries, we've had an explicit system for organizing print books in the form of page numbers and bibliographic info. 数百年来,我们有一个明确的系统,按照页码和书目信息来安排整理我们的印刷本书籍。