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On 1/18/13 1/18/13  9:24 AM, "Ross Singer" <[log in to unmask]> wrote:

> How often, on aggregate, is the 100 or 700 $4 or $e used?  Since I've parsed a
> lot of MARC records, I can tell you.  Not much (and the inconsistency of the
> $e makes this even less useful).

I can tell you exactly, as of December 1, 2012 in WorldCat:

Total number of records: 287,229,344
Total occurrences of a 700 field: 80,731,356
Total occurrences of 700 $4: 24,908,408
Total occurrences of a 700 $e: 14,117,538

Roy