There are two standard options for searching:
- Basic search - provides one search box
- Advanced search - offers multiple boxes. A pulldown menu associated with each box allows searching with more options.
These boxes can be joined by the standard Boolean operators AND, OR, NOT. These can be used in both basic and advanced searches.
Advanced search also provides the option of applying up to five filters to specify geographic location(s) and classification(s); one also can specify a particular date or range of dates.