Scanned images of selected journal articles are available. Searches can be limited to specific journals in some cases. The main search parameters, the filters, and the settings. You can search for specific astronomical objects, e.g. M31 or Andromeda Galaxy, by object name. You can limit searches by date or date range.
Boolean logic is supported.
Various filters allow you to further refine a search, e.g. minimum score, refereed journals only, and references containing only selected kinds of information.