NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 6160-2003
Micrographics--First generation silver-gelatin microforms of source documents--Density specifications and method of measurement 缩微摄影技术 源文件第一代银--明胶型缩微品密度规范与测量方法
Issued Date:2003-05-14
Implemented Date:2003-12-01
Issued by:
The Standardization Administration of the People's Republic of China