440 Subfield $v - Volume number/sequential designation:

Subfield $v contains the volume number or other sequential designation used in a series statement.

Examples:

440 #0$aEnvironmental science research ;$vv. 4

440 #0$aRussian titles for the specialist,$x0305-3741 ;$vno. 78

[AACR 2 record with order of subfields $x and $v.]

440 #4$aRomanica Gothoburgensia ;$v12, 16$x0080-3863

[Pre-AACR 2 record with order of subfields $v and $x.]