In conjunction with NTIS, Northern Light introduced usgovsearch for searching U.S. federal government Web sites, the NTIS bibliographic database, and Northern Light's Special Collections. Free searching is available to public libraries, K-12 public school libraries, and depository libraries. Otherwise a daily, monthly, or annual charge is required for access to the service. The government Web sites included in this service go well beyond the simple limiting of a search to .gov and .mil top level domains available in the Power Search on regular Northern Light. Searching can be nested using parentheses.
Operators can be in lower or upper case.
Note that words within a phrase will be searched in both singular and plural form. No other proximity operators are available. Northern Light has two truncation symbols. This can be used as internal truncation or end truncation, but a minimum of four characters must appear before a truncation symbol can be used. A single term can include more than one truncation symbol.