Roy Tennant of OCLC research recently released a new website, MARC Usage in WorldCat. The site reports how MARC has actually been used as evidence by the "WorldCat aggregation".
For each MARC field, you can see the number of uses of each subfield. A screen shot of the report for MARC field 337:Media Type shows that the field has been used in 199,079 records held by 1,764,210 institutions. In some cases underlined subfields maybe expanded to show the actual data elements entered.
This is intended as a temporary service to be updated quarterly through 2013.
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