USGS Science Center: USGS water resources and biological research offices are usually divided by state and are called science centers. You can find a list and descriptions of science centers on the USGS home page at http://water.usgs.gov/.
Project: Each biological community sample in BioData belongs to one and only one project. Typically data collected for a single Project has consistent objectives, design, and methods.
NAWQA study unit: In the beginning cycles of the National Water Quality Assessment Program (NAWQA), the United States was divided into river basins, or study units, in order to collect consistent data on a watershed scale across the country. Some of the study units may cross state boundaries. For additional information and further descriptions of NAWQA study units refer to http://water.usgs.gov/nawqa/nawqamap.html.
Hints and Tricks:
You can only use one filter from this section at a time
Within a filter option, multiple selection can be made (e.g. multiple USGS Science Centers can be selected)
Click the links in the filter options panel above for more information
USGS Science Center provides a 'starts with' search box to help limit the list of options
Project provides a 'contains' search box that REQUIRES (see below) at least 2 characters to view a list
NAWQA Study Unit also provides an optional 'contains' search box; if used, it still requires two characters
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