535 LOCATION OF ORIGINALS/DUPLICATES NOTE (R)Indicators First Additional information about custodian 1 Holder of originals 2 Holder of duplicates 3 Holder of oral tapes (AM) OBSOLETE Second Undefined; contains a blank (#)Subfield Codes $a Custodian (NR) $b Postal address (R) $c Country (R) $d Telecommunications address (R) $g Repository location code (NR) $3 Materials specified (NR) $6 Linkage (NR)