http://www.ozgrid.com/Excel/compare-excel-ranges.htm
http://office.microsoft.com/en-us/excel/ha011039151033.aspx
Use Excel to compare two lists of data
http://www.exceltip.com/st/Compare_two_worksheets_using_VBA_in_Microsoft_Excel/477.html
http://www.sobolsoft.com/excelcompare/
Excel Compare Data in Two Tables Software
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