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Note on number indexes
MLN1:
ISN (i) includes 010, 020, 022, 028, 074, and non-MARC ISBN/ISSN fields
UPC (j) includes 024
GOVT DOC # (g) includes non-MARC GOVT. DOC# (g)
BARCODE (b) includes item record barcode
RECORD # (.) includes record numbers of all record types
MLN2:
LCCN (l) includes 010
ISBN/ISSN (i) includes 020, 022, and non-MARC ISBN/ISSN fields
Other Number (v) includes 024, 028, 074, 910
Gov Doc Number (g) includes 086 and non-MARC GOVT.DOC# (g)
BARCODE (b) includes item record barcode
RECORD # (.) includes record numbers of all record types
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