Diane Westerfield <Diane.Westerfield@coloradocollege.edu> wrote:

...
to strange combinations and repetitions.


The repetitions may be the ISSN-L (022 $l) which can mirror the print ISSN also given in the record.
<http://www.issn.org/en/understanding-the-issn/assignment-rules/the-issn-l-for-publications-on-multiple-media/>

--
Mark K. Ehlert                 Minitex
Coordinator                    University of Minnesota
Digitization, Cataloging &     15 Andersen Library
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Phone: 612-624-0805            Minneapolis, MN 55455-0439
<http://www.minitex.umn.edu/>

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