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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). Use OAIster to search across repositories.
ART-Dok is the full-text server of the Virtual Library for Art, arthistoricum.net and is made available by Heidelberg University Library. It offers members of the academic community worldwide the opportunity to publish their texts in electronic format on the internet at no charge.