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CoConEa
Dll-encapsulated coordinate transformation product.
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.