X30 Subfield $k - Form subheading:

Subfield $k contains a form subheading used in a uniform title heading.  Form subheadings used with uniform titles include Manuscript, Protocols, etc., and Selections.

Examples:

130  #0  $aBible.$pO.T.$pFive Scrolls.$lHebrew.$sBiblioteca apostolica Vaticana.$kManuscript.$nUrbaniti Hebraicus 1

130  #0  $aConvention for the Protection of Human Rights and Fundamental Freedoms$d(1950).$kProtocols, etc.

130  #0  $aPortrait and biographical album of Isabella County, Mich.$kSelections