Serials
In general, for titles that fit the definition of a serial, use a serial record if it has been assigned an ISSN and/or there is a CONSER-authenticated record available.[1] The absence of these criteria does not necessarily mean a monograph record should be used.
If individual issues of a serial require contents notes or different access points, or if the serial is issued in discrete multivolume sets, use monograph records.
Libraries that use MARC holdings records to convey standing order information will need to use serial records.
Before 2010 CCS considered the content of the work when deciding whether to use a serial record.
There must only be one treatment in the database for totally identical material.[2][3] If such "duplicate" records have been created, please choose the format that is appropriate (serial or monograph) and merge or split the records accordingly.