Code 017 - Other Standard IdentifiersIndicator 1: Type of standard number or code 7 Source specified in Subfield 2 8 Unspecified type of standard number Indicator 2: Difference Indicator 0 No information provided 1 No difference 2 DifferenceSubfield Codes $a Standart number (NR) $b Terms of availability (NR) $z Erroneous number or code (R) $2 Source of code (NR)