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GB/T 6160-2003
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Micrographics-
First generation silver-gelatin microforms of source documents
-Density specifications and method of measurement
(ISO 6200:1999£¬MOD)
GBT 6160-2003 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.pdf