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Some catalogue records incorporate Web links to other resources, including online bibliographic and image databases, electronic encyclopaedias and, in some cases, the full texts of journals and other publications.
The online catalogue provides information about all forms of material held by the Library, both the documentary collections of literature about the arts and design, and the material, both historic and contemporary, which now forms part of the VandA Word and Image department's curatorial collections.
It is recognised that regular users of the Library may be still be interested in the older catalogues, and that they are historic artefacts in their own right.
Ptolemy's catalogue was based almost entirely on an earlier one by Hipparchus from the 2nd century BC (Newton 1977; Rawlins 1982).
The catalogue was compiled by Annie Jump Cannon and her co-workers at Harvard College Observatory under the supervision of Edward Pickering, and was named in honour of Henry Draper, whose widow donated the money required to finance it.
Although this version of the catalogue was termed "preliminary", it is still the current one as of March 2006, and is referred to as CNS3.