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The means by which the information on a microfiche is retrieved. There are several indexing techniques available today. These includecorner indexing, column indexing, master-file indexing, and cross-reference indexing.; 检索缩微胶片上信息的方法。目前有多种索引技术,包括边缘索引、列索引、主文件索引和交叉引用索引。