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The geographic coordinate system is GCS_Assumed_Geographic_1 for the SDC datasets from ESRI Data & Maps 2004.
The .PRJ file for each SDC dataset from ESRI Data & Maps 2004 is named <filename>.sdc.prj. ArcGIS versions 8.2 and 8.3 expect the name of the prj file to be <filename>.prj.
There are two solutions: