Columbia subject headings:
Online bibliographic searching.
Online library catalogs--Subject access.
Searching, Bibliographical.
Subject catalogs--Use studies.
Harvard subject headings:
Online bibliographic searching
Online library catalogs--Subject access
Searching, Bibliographical
Subject catalogs--Use studies
Princeton subject headings:
Online bibliographic searching.
Online library catalogs--Subject access.
Searching, Bibliographical.
Subject catalogs--Use studies.