This searchable database of reports and thematic maps currently contains more than 69,000 United States Geological Survey (USGS) bibliographic citations, including USGS numbered series begun as early as 1880. The basic search options include author and/or title. Advanced search options include author, text in title, year or range of years, publication series and number, and a variety of options for ... Full description.

This topical directory provides an alternate way to browse United States Geological Survey (USGS) science programs and activities. It is not an exhaustive list of all USGS science topics but provides a categorization using a thesaurus of related terms that will give definitions, links to science content, and a structured approach to discovery. The directory is divided into fourteen major topic headings, ... Full description.