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SAO/NASA ADS -> Help -> Data Holdings
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    5.1 - Full-text Data Holdings

    The ADS article service provides access to the full-text of over 500,000 scientific papers published in astronomical journals, conference proceedings, newsletters, bulletins and books, for a total of over 3.7 million pages. All these pages have been scanned as bitonal images at the optical resolution of 600 dots per inch (dpi) and are stored as compressed TIFF images at two different resolutions (200dpi and 600dpi). All the different output formats supported by the article service software are created on demand (and optionally cached on disk) from the original TIFF images by a number of format translator programs.

    We are continuously adding new full-text scans and correcting problems or coverage gaps with existing online publications. To have an accurate idea of the current data holdings, please see the following pages:

    As we attempt to complete our coverage of full text for all astronomical journals, we are looking for donations of some missing titles. If you can help, please let us know.

    Please note that most of the recent journal articles are available electronically from their publishers, and therefore have not been scanned by the ADS. In this case, the ADS will still have a bibliographic record corresponding to the paper and will have a link to the electronic version available from the publisher. However, access to the full-text is controlled by the publisher, which usually requires a current subscription. More information on this is available in the Access Control help page.

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