Specify the information you would like to search. Classifications are common subject categories found in the database, listed alphabetically. Select by clicking the classification you would like to search. Countries are the main nations or regions referred to in an article, paper, or book. Select by clicking on one or more countries of interest, following the above directions.
Basins refer to a specific water catchment area.
You may search by specific keywords in the keywords field. Multiple keywords should be separated by spaces. Because of possible spelling variations, you may have more success typing one key word in a name or title rather than the full name or title. Many of the entries in the database are not published. If you leave it blank, both will be returned.