552 ENTITY AND ATTRIBUTE INFORMATION NOTE (R)
Indicators - Both undefined; each contains a blank (^)
Subfield Codes $a Entity type label (NR) $b Entity type definition and source (NR) $c Attribute label (NR) $d Attribute definition and source (NR) $e Enumerated domain value (R) $f Enumerated domain value definition and source (R) $g Range domain minimum and maximum (NR) $h Codeset name and source (NR) $i Unrepresentable domain (NR) $j Attribute units of measurement and resolution (NR) $k Beginning date and ending date of attribute values (NR) $l Attribute value accuracy (NR) $m Attribute value accuracy explanation (NR) $n Attribute measurement frequency (NR) $o Entity and attribute overview (R) $p Entity and attribute detail citation (R) $u Uniform Resource Identifier (R) $6 Linkage (NR) $8 Field link and sequence number (R)