Columbia subject headings:
Indexes.
Indexing.
Information retrieval.
Information storage and retrieval systems.
Subject cataloging--Data processing.
Subject catalogs.
Harvard subject headings:
Indexes
Indexing
Indexing--Data processing.
Information retrieval
Information storage and retrieval systems
Machine-readable bibliographic data
Online bibliographic searching
Online library catalogs--Subject access
Subject cataloging--Data processing.
Subject catalogs
Princeton subject headings:
Indexing--Data processing.
Machine-readable bibliographic data.
Online bibliographic searching.
Online library catalogs--Subject access.
Subject cataloging--Data processing.
Subject catalogs.