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Having worked at several bibliographic database companies, I can assure
you, this is A Thing. It's not huge, but it's enough to be quite
noticeable. Publishers re-use ISBNs, and it drives data recipients crazy.

On 5/20/13 2:02 PM, "Shlomo Sanders" <[log in to unmask]>
wrote:

>Sorry, no numbers, but I have heard complaints of different works having
>the same ISBN.
>
>Thanks,
>Shlomo
>
>Sent from my iPad
>
>On May 20, 2013, at 20:53, "Harold E. Thiele" <[log in to unmask]>
>wrote:
>
>> Thanks to Mac and Roy, we now have some hard numbers revealing the
>>number of records having no association with ISBN numbers or are
>>associated with multiple ISBN numbers. This is just one side of the
>>problem. The other side, mentioned several times, is the association of
>>a single ISBN number with two or more works or instances. It would be
>>equally informative if the numbers could be generated to illustrate the
>>size of this problem.
>> 
>> 
>> Harold E. Thiele, MLIS, PhD
>> Assistant Professor
>> Master of Library and Information Science Program
>> Odum Library
>> Valdosta State University
>> 1500 N. Patterson St.
>> Valdosta, GA 31698-0150
>> email - [log in to unmask]
>> voice: 229 333 5966  fax 229 259 5055
>> 
>> ________________________________________
>> From: Bibliographic Framework Transition Initiative Forum
>>[[log in to unmask]] on behalf of Tennant,Roy [[log in to unmask]]
>> Sent: Monday, May 20, 2013 11:06 AM
>> To: [log in to unmask]
>> Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records
>> 
>> As requested, numbers from WorldCat, the 1 May 2013 Research snapshot,
>>with 296,589,450 records:
>> 
>> NO. of Recs ISBNs Percent
>> 
>> 230402772  0 77.68%
>> 58861390  2 19.85%
>>  4269211  4  1.44%
>>  1659221  1  0.56%
>>   515674  6  0.17%
>>   466645  3  0.16%
>>   151133  8  0.05%
>>    84572  5  0.03%
>>    51967 10  0.02%
>>    33372 12  0.01%
>> 
>> Keep in mind that WorldCat, being the largest library union database in
>>the world, includes a great deal of material that pre-dates the
>>establishment of the ISBN.
>> Roy
>> 
>> From: Shlomo Sanders
>><[log in to unmask]<mailto:[log in to unmask]
>>>>
>> Reply-To: Bibliographic Framework Transition Initiative Forum
>><[log in to unmask]<mailto:[log in to unmask]>>
>> Date: Monday, May 20, 2013 5/20/13  6:19 AM
>> To: "[log in to unmask]<mailto:[log in to unmask]>"
>><[log in to unmask]<mailto:[log in to unmask]>>
>> Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records
>> 
>> From a large sample of data that we get from publishers:
>> 
>>  *   Only 24.5% with one ISBN!
>>  *   40% with multiple ISBNs!
>>  *   Largest group has no ISBN!
>> 
>> 
>> ISBN Count      Percentage of records with X ISBNs
>> 0       38.57%
>> 1       24.49%
>> 2       17.00%
>> 3       5.88%
>> 4       10.77%
>> 5       2.14%
>> 6       0.65%
>> 7       0.09%
>> 8       0.12%
>> 9       0.24%
>> 10      0.04%
>> 
>> 
>> Thanks,
>> Shlomo
>> 
>> Experience the all-new, singing and dancing interactive Primo brochure
>> 
>> 
>> -----Original Message-----
>> From: Bibliographic Framework Transition Initiative Forum
>>[mailto:[log in to unmask]] On Behalf Of J. McRee Elrod
>> Sent: Sunday, May 19, 2013 20:34
>> To: [log in to unmask]<mailto:[log in to unmask]>
>> Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records
>> 
>> In SLC's database of over 300,000 records, over 169,000 have no ISBN,
>>over 114,000 have one, over 19,000 have two, and the number of ISBNs
>>ranges up to 36 in one record.
>> 
>> For us, Instances can't be based on ISBNs.
>> 
>> 
>> Total Records: 315389
>> 
>> 020s  Records
>> 
>> 00 169021
>> 01 114221
>> 02  19745
>> 03   7403
>> 04   3238
>> 05   1149
>> 06    344
>> 07    118
>> 08     29
>> 09     42
>> 10     11
>> 11     16
>> 12     10
>> 13     12
>> 14      4
>> 15      5
>> 16      3
>> 17      7
>> 18      1
>> 19      1
>> 21      1
>> 22      1
>> 23      1
>> 25      3
>> 27      1
>> 28      1
>> 36      1
>> 
>> 
>> 
>>   __       __   J. McRee (Mac) Elrod
>>([log in to unmask]<mailto:[log in to unmask]>)
>>  {__  |   /     Special Libraries Cataloguing   HTTP://www.slc.bc.ca/
>>  ___} |__ \__________________________________________________________
>>