520 SUMMARY, ETC. NOTE (R)
Indicators First Display constant controller # No information provided 0 Subject 1 Review 2 Scope and content 3 Abstract 8 No display constant generated Second Undefined; contains a blank (#)
Subfield Codes $a Summary, etc. note (NR) $b Expansion of summary note (NR) $z Source of note information (NR) OBSOLETE $3 Materials specified (NR) $6 Linkage (NR)