| http://www.w3.org/ns/prov#value | - Speaking of quads, the USDA has a site http://datagateway.nrcs.usda.gov/ where you can download countywide mosaics of USGS 7.5' quads in MrSID. Saves a lot of work getting and compiling quads, especially as they include quads that have even a little bit in the county he is mosaicked, so you do not often need to download both counties when your feature of interest tends to follow county lines.
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