Karen, at the ISBN Agency we've discovered that this is not consistent. Amazon doesn't supply an ISBN - the publisher does. And many publishers don't bother assigning an ISBN to their mobi files, because it's not a requirement at Amazon. BN/Nook assigns a proprietary EAN if no ISBN is provided by the publisher. Best practice dictates that different formats receive unique ISBNs, but many publishers don't adhere to that. 

The number soars, but not consistently. 

From: Karen Coyle <[log in to unmask]>
Reply-To: <[log in to unmask]>
Date: Monday, May 20, 2013 10:40 AM
To: <[log in to unmask]>
Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records

Another interesting piece of data:

For eBooks, if they are distributed by different vendors (Amazon v. iTunes, etc.), each VENDOR provides a different ISBN. So the exact same thing gets more than one ISBN. Also, every different eBook format from the same vendor is supposed to have a different ISBN: PDF, ePub, Mobi, etc. So as we go more digital, the number of ISBNs expands soars!

kc

On 5/20/13 7:05 AM, David Weinberger wrote:
[log in to unmask]" type="cite">
Is this information from Mac Elrod and Shlomo Sanders the frequency of ISBNs publicly bloggable? It's very interesting.

- David Weinberger


On Mon, May 20, 2013 at 9:19 AM, Shlomo Sanders <[log in to unmask]> wrote:
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]
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])
  {__  |   /     Special Libraries Cataloguing   HTTP://www.slc.bc.ca/
  ___} |__ \__________________________________________________________
 


-- 
Karen Coyle
[log in to unmask] http://kcoyle.net
ph: 1-510-540-7596
m: 1-510-435-8234
skype: kcoylenet