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The problem is that the data was never in UTM to begin with, and so by having a UTM projection, the file was ultimately being told to be something it wasn't. (Such is life) :) Reprojecting it doesn't fix the problem, because the transformation math is based on coordinates that don't match the assigned projection. To fix this I deleted the .prj file, and ...


To figure out which file has a problematic projection and get additional clues about how to fix it, you can plot the maps on an ArcGIS basemap. This will get the shapefiles to appear on the same screen so you can see which is problematic. In this case you can quickly see that the SourceA file is plotted off in the Atlantic Ocean far from it's proper ...

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