Chip Pearson has lots of techniques to work with duplicates:
http://www.cpearson.com/excel/Duplicates.aspx

Philip Drury wrote:

Hi, have a workbook with 2 spreadsheets, first one is the master list (with
unique references), second one is an extract (containing duplicated data).
Can anyone help me with a way of looking at the unique references on sheet 2,
finding the duplicate reference on sheet 1 and deleting the row from sheet 1??
Any help much appreciated
Philip

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Dave Peterson