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OAIster is a union catalog of millions of records representing open access resources that was built by harvesting from open access collections worldwide using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH). Today, OAIster includes more than 25 million records representing digital resources from more than 1,100 contributors. Access to OAIster
You can conduct an interdisciplinary search in the stocks of the German National Libraries for Science and Technology, Medicine and Economics as well as of other specialised databases.
is the most comprehensive scientific research tool on the web.