ACS2010 & DDA_ACS > MapView:
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dBMerge - merging two dBase 4 files based on common key.
Open Source File 1
Open Source File 2
Select and Move Fields
Preparing for Merge; Remove Selected Field
Set Merge Keys; Start Merge
Completion of Merge
Help URL: http://www.proximityone.com/help/index.html?gis_dbmerge.htm