I have downloaded some of SEDAC's 1980 census tract boundary files in "BNA" format, but am unable to read them in Arc GIS 8.1. I was told that there should be a conversion program "bna2shp.exe" somewhere on your site but am unable to find it.

There is a script from ESRI’s ArcScripts site that converts Atlas bna files to shape files, please see: http://arcscripts.esri.com/details.asp?dbid=11491

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