Fields 800-830 contain series added entries for series associated with a title. These fields are used to trace a series added entry when the form of series present in the 490 Series Statement field cannot serve additionally as a series added entry.
A description of the first indicator and all subfield codes, as well as input conventions for the 800, 810, 811, and 830 fields, are given in the following General Information sections: X00, X10, X11, and X30. The second indicator is described in the specific section for each field.
Field 840 - Series Added Entry - Title [OBSOLETE, 1980]
Field 840 was made obsolete when the decision was made to use field 830 for both uniform titles and conventional titles that are not entered under a name. For field 840, the first indicator was undefined; the second was defined for nonfiling characters (values 0-9). The subfield codes were: $a (Title), $h (Medium), $v (Volume or number).