| Summary: | This 105-page report is deposited with permission of the Digital Library Federation which retains copyright. It is freely available in html and pdf formats at the DLF Web site or may be purchased in softcover edition for $20 from DLF. === This report, commissioned by DLF, provides an overview of a diverse set of more than thirty digital library aggregation services, organizes them into functional clusters, and then evaluates them more fully from the perspective of an informed user. Most of the services under review rely wholly or partially on the Protocol for Metadata Harvesting of the Open Archives Initiative (OAI-PMH). Each service is annotated with its organizational affiliation, subject coverage, function, audience, status, and size. Critical issues surrounding each of these elements are presented in order to provide the reader with an appreciation of the nuances inherent in seemingly straightforward factual information, such as "audience" or "size." Each service is then grouped into one of five functional clusters: open access e-print archives and servers; cross-archive search services and aggregators; from digital collections to digital library environments; from peer-reviewed "referratories" to portal services; specialized search engines. This publication was deposited
with permission of the publisher (Digital Library Federation
Council on Library and Information Resources
Washington, DC.).
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