Aerial Photography Field Office: A clearinghouse for archived aerial photographs (black & white, color infrared, and true color) by the U. S. Department of Agriculture Natural Resources Conservation Service. Photographs are available in scales from 1″ = 5000′ to 1″ = 200′. To order, send the APFO a legal description of the area (Township, Range, Section), lat & long. coordinates, or the area identified on a topo, county or city map. Pre-payment is required. Payment can be made by purchase order (govt. agencies only), checks, money orders, Visa, Mastercard, Discover and American Express. Once ordered, the APFO will duplicate the photos and send them to you. Expect 4 – 6 weeks for development time and 10 days for shipping.
National Wetlands Inventory: Contains downloadable National and Regional lists of plants that occur in Wetlands and digitized data from the National Wetlands Inventory wetland maps. The digital maps can be viewed with ArcExplorer, downloadable from ESRI, Inc..
Natural Resources Conservation Service Hydric Soils Page: Contains downloadable NTCHS hydric soil criteria, national hydric soil lists and state hydric soil lists.
Section 404 of the Clean Water Act: The full text of this section.
Society of Wetland Scientists: A superb organization of wetland scientists and practitioners.
Terraserver: A joint effort of the US Geological Survey, Microsoft, and the Russian Space Agency. This page allows one to view black & white aerial photographs of high (down to 1 pixel = 6′) resolution for no charge. (Other photographs are for a fee.)