6C1.

If the source bears a series title in more than one language or script, transcribe as the series title proper the title that is in the language or script of the title proper.  If this criterion does not apply, transcribe the title that appears first in the source.  Transcribe the remaining title(s), together with any associated information, as parallel series titles.  Precede each parallel series title by an equals sign.  Make a note to indicate the original position on the source of any transposed titles.

6C2.

Optionally, if it is considered that the parallel series titles are too numerous to list exhaustively, and that some may be omitted without significant loss of identification, omit parallel series titles after the first using the mark of omission.  Transcribe the omitted title(s), together with any associated information, in a note, if considered important.

LC Rare Book Team Guidelines:  Cataloger's judgement.

See also:

6.  Series Area