Hmm, 2 ISBNs in 2nd place -- how many are situations of coupled ISBN-10 and ISBN-13 pairs and how many are "distinct"? The "instance" plot thickens. :-)
John F. Myers, Catalog Librarian
Schaffer Library, Union College
Schenectady NY 12308
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518-388-6623
-----Original Message-----
Roy Tennant wrote:
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.
