863-865 Subfield $a - First level of enumeration:
Subfield $a contains the highest level of enumeration. The designation for an unnumbered (for example, new ser.) or a numbered (for example, ser. 5) series is considered caption data and is contained in subfield $a (First level of enumeration) of the related 853-855 Captions and Pattern field.
Examples:
855 ## $81$a(year)$wa
865 4# $81.1$a1918$osubject index
865 4# $81.2$a1919$osubject index
865 4# $81.3$a1920$osubject index
865 4# $81.4$a1921$osubject index
[Holdings consist of indexes for the years 1918-1921.]
853 01 $81$av.
853 01 $82$anew ser.:v.
863 40 $81.1$a1-25
863 40 $82.1$a1-12
[Holdings consist of v. 1-25 and new series v. 1-12.]
853 01 $81$aser.5:v.$i(year)
863 40 $81.1$a24-33$i1969-1978
[Holdings consist of series 5, v. 24-33, 1969-1978.]
When the enumeration consists of the number of units held followed by a term describing the units, the whole phrase is contained in the related 863-865 subfield.
Examples:
853 03 $81$a(unit)
863 #1 $81.1$a1 score
853 03 $81$a(unit)
863 31 $81.1$aca. 1000 items
To return:
Use the key.