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I have autocad 2015 with Carlson civil. And just recently bought arcgis for desktop. How and where do I get USGS topo data with elevation into my autocad file useing a state plane projection? Or what is the best method of getting topography into autocad with elevations and a projection?
That's not a vanilla acad capability. You'll be best served talking to the Carlson people.
Might also try theswamp.org -- there are some people using carlson there. registration required.