The following is an example of how to cite the USGS Aquatic Bioassessment Data for the Nation (aquatic.biodata.usgs.gov) website in a publication.
U.S. Geological Survey, , BioData - Aquatic Bioassessment Data for the Nation available on the World Wide Web, accessed [June 10, 2012], at URL http://aquatic.biodata.usgs.gov/.
Please substitute your year and date, and remove brackets.
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