1) setup a temporary Library and put all of your books in it. This process can destroy your library if you do it wrong
2) in the temporary library, select some books
3) open the Edit Metadata dialog
4) open the search and replace dialog
5) in the search field select identifiers
6) select an identifier type
7) in the Search for field enter ".*" without the quotation marks
8)leave the Replace With field blank
9) review the Test Text dialog to preview changes, if nothing appears in the Test Text fields, then select another identifier type in 6) above
10) If you are happy with the results in the right hand fields, click apply.
11) review the metadata for the books that was just modified
12) repeat this process as necessary
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