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Synopsis With the advent of digital technology, many knowledge creators do their work on computers. Some of that knowledge may be printed on paper, but much of it, particularly databases, geographic information, scientific data sets, and websites, exists only in electronic form. The digital documents are vulnerable to loss via decay and obsolescence of the media on which they are stored, and they become inaccessible and unreadable when the software needed to interpret them, or the hardware on which that software runs, become obsolete and is lost. The techniques and strategies used for preserving digital library materials are elaborately described in the present volume. It explores the technical depth of the problem of long-term digital preservation, analyses and inadequacies of a number of ideas that have been proposed as solutions and elaborates the emulation strategy. It will serve as a highly beneficial reference tool for practising librarians and students and teachers of library and information science.