650 - Subject Added Entry--Topical Term (R)

Indicators	1st -	Level of subject
		# - No information provided
		0 - No level specified
		1 - Primary; main focus of subject content
		2 - Secondary; less important aspect of content
	2nd -	Subject heading authority or Thesaurus
		0 - LC (Library of Congress)
		1 - LC subject headings for children's literature (LCAC)
		2 - Medical subject headings; conforms to NLM (National Library of Medicine)
		3 - National Agricultural Library
		4 - Source not specified
		5 - Canadian subject headings
		6 - French subject headings; Repertoire de vedettes-matiere; conforms to NLC authority fields.
		7 - Source specified in subfield 2

Subfields	_a	Topical term or geographic name (NR)
	_b	Topical term following geographic name (NR)
	_c	Location of event (NR)
	_d	Active dates (NR)
	_e	Relator term (NR)
	_v	Form subdivision (R)
	_x	General subdivision (R)
	_y	Chronological subdivision (R)
	_z	Geographic subdivision (R)
	_0	Authority record control number (R)
	_2	Source of heading or term (NR)
	_3	Material specified (NR)
	_4	Relator code (R)
	_6	Linkage (NR)
	_8	Field link and sequence number (R)

Examples