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The Catalogue of Life is the most comprehensive and authoritative global index of species currently available. It consists of a single integrated species checklist and taxonomic hierarchy. The Catalogue holds essential information on the names, relationships and distributions of over 1.8 million species. This figure continues to rise as information is compiled from diverse sources around the world.
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Zvdd aims to record all digital surrogates of printed works, which are available from the internet and meet certain quality criteria. This comprised all types of printed works, such as newspapers, journals, printed music, flying leaves as well as monographs or serials.