Non-English Language Cataloging can usually be identified by the presence of
040 subfield $b coded for the language of cataloging.

Enhance libraries may recatalog these records, changing appropriate (mostly notes)
fields to English. If you choose to recatalog, OCLC prefers that the physical description
(300) and all appropriate notes be brought into line with current standard AACR2
and MARC 21 practice, so as to avoid unnecessarily hybrid records. If you replace
the non-English descriptive cataloging with English, you should remove the
corresponding 040 subfield $b "Language of Cataloging" designation. If the record
contains non-English language subject headings (in uncontrolled heading field 653 as
well as those in 6XX fields with Second Indicator "4," or "7" with a suitable
subfield $2 value), leave these headings unaltered. You are encouraged to add
English-language subject headings. Generally refrain from removing other existing access
points, contents notes, and classification numbers unless the information is clearly
in error. Again, you are encouraged to update the forms of headings to match the
authority file or to current AACR2 form if they are not found there.