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 | CoordTrans: - Convert geographic coordinates between UTM, WGS84, NAD83, NAD27 and other national grids. |
 | Decimaldegrees: - Investigation of and experimentation with various GIS technologies, and the Internet. Latitude, longitude conversion and geocoding tools. |
 | SeisSoft: - Producers of projection and datum transform software. |
 | ZipMath: - World database with latitude and longitude coordinates. Includes formula for calculating the distance between any two world cities. |
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