| anacostiaws.org | Anacostia Watershed Society |
| potomacriver.org | Anacostia River Business Coalition |
| nrdc.org | National Resources Defense Council: Cleaning Up the Anacostia River |
| environmentors.org | Environmentors |
| caseytrees.org | Casey Trees Endowment Fund |
| anacostiawaterfront.net | Anacostia Waterfront Initiative |
| usgs.gov | Earthquake History of the District of Columbia |
| georgetown.edu | Biodiversity Database of Washington DC |
| dc.gov | DC Department of Health - Environmental Health Administration |
| lisnews.com | Washington, D.C. Natural History Bibliography |
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