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--- isbn_duplicates [2013/05/19 23:35]
+++ isbn_duplicates [2021/12/29 16:21] (current)
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+====== ISBN Duplicates ======
+This exercise was inspired by a post on the 'BIBFRAME' list asking whether publishers really did re-use ISBNS. Many catalogers have known the answer to this question for years, but I thought it might be worth 20 or 30 minutes to see what I could find out using a few handy tools.
+I started with a file of about 800,000 records from a primarily public library cooperative. I used our [[http://www.marcofquality.com/wiki/plp|PLP software]] to identify all the records containing duplicate ISBNs. A nice thing about PLP is that it will split the dupes into exact matches and 'near-matches' by applying about 20-25 crosschecks once the records with matching ISBNs have been selected.
+I loaded the file of near-matches into MARC Report and composed a simple title list. I started scanning through the list of titles for these duplicates, and whenever I found two titles that were radically different, I searched the ISBN on worldcat. After about 1,000 titles, I stopped, having decided that the answer to the querstion was clear.
+In those 1000 records, I found 13 groups of duplicates that might qualify for this problem.
+I have posted the screenshots of the 13 worldcat results below:
+{{:241:snap1.png|}}
+{{:241:snap2.png|}}
+{{:241:snap3.png|}}
+{{:241:snap4.png|}}
+{{:241:snap5.png|}}
+{{:241:snap6.png|}}
+{{:241:snap7.png|}}
+{{:241:snap8.png|}}
+{{:241:snap9.png|}}
+{{:241:snap10.png|}}
+{{:241:snap11.png|}}
+{{:241:snap12.png|}}
+{{:241:snap13.png|}}
+Ideally we need to check the actual items to see what numbers are actually printed on them.

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