International Organization for Standardization (ISO)
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ISO 999:1996
Scope
Gives guidelines for the content, arrangement and presentation of indexes to books, periodicals, reports, patent documents and other written documents, also to non-print materials, such as electronic documents, films, sound and video recordings.
ISO 999:1996 history
1996ISO 999:1996 Information and documentation - Guidelines for the content, organization and presentation of indexes
1975ISO 999:1975 Documentation; Index of a publication