Combine the documents - convert the tables to text - sort the text - remove
any duplicates - use the resulting file as a data source to re-merge to a
new document.
The process is fully covered at:
http://www.gmayor.com/convert_labels_into_mail_merge.htm
The automatic removal of duplicates is covered at
http://word.mvps.org/FAQs/General/UsingWildcards.htm

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Graham Mayor - Word MVP
Web site www.gmayor.com
Word MVP web site www.mvps.org/word
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> We need to combine several mail merges into one
> document, and weed out any duplicate labels. Is
> there any easy way to do this in Word 97?