Topical	Specialized groupings of related publications.
Science Programs	Distinct research programs established by the USGS to investigate the geological landscape plus natural, environmental, and biological resources.
Science Offices	Concentrated investigation units provide scientific information and evaluations to decision makers.

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• Basic Search: Searches the main citation fields in the database. You can enter multiple search parameters into this text box. Operators (AND, OR, NOR) are not required but can be used. Use words that are like to be in the citation and use terms that are descriptive for what you are looking for. The search accounts for the possibility of plurals and other alternate word endings.
  
  For example "rapids" will bring back results that have the word "rapid" in it. Searching on "river rapids" will narrow the search down to publications containing both terms.
  
  Searches are case insensitive.
  
  
• Advanced Search: Select the field you would like to search on from the drop down list on the left. Enter a search term in the field to the right.
  
  You may fill in search criteria in any of the search boxes, however, you do not have to fill in every search box. Leaving a search box blank does not limit the data being retrieved. To add additional search boxes, if needed, click on the 'Add' button.
  
  
• Search only online documents checkbox: This limits your search results to only retrieve citations that have an online document. These documents can include websites located throughout the USGS, PDF files, or documents stored with in the Publication Warehouse.
  
  

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