[type of data: transcribed data (literal); repeatable]
Transcribe numeric and/or alphabetic designations as they appear on the first issue of the first serial title of the expression, preceded by the phrase "Began with:." If the serial is no longer on-going, transcribe numeric and/or alphabetic designations as they appear on the last issue of the last serial title of the expression, preceded by the phrase "Ended with:." If the cataloger does not have access to the first issue, or is uncertain if the issue in hand is the first, transcribe the numeric and/or alphabetic designation as it appears in a note preceded by the phrase "Description based on:"