本文件有助于确保成品封套可以复制，封套缩微胶片上缩微胶片图像的放置类似于标准缩微胶片图像的放置，并且副本的质量和可读性可接受，以允许在任何标准的统一缩微胶片检索设备上查看和/或硬拷贝复制。

This document helps ensure finished jackets can be duplicated, placement of microfilm images on jacketed microforms resembles standard microfiche image placement, and duplicate copies are of acceptable quality and legibility to allow viewing and/or hardcopy reproduction on any standard unitized microfilm retrieval device.