Columbia subject headings:
Library of Congress. Subject Cataloging Division. Library of Congress subject headings.
Online bibliographic searching.
Online library catalogs.
Subject cataloging.
Subject headings.
Harvard subject headings:
Library of Congress. Subject Cataloging Division. Library of Congress subject headings.
Online bibliographic searching--Problems, exercises, etc.
Online bibliographic searching.
Online library catalogs--Subject access--Problems, exercises, etc.
Online library catalogs.
Subject cataloging--Problems, exercises, etc.
Subject cataloging.
Subject headings
Subject headings, Library of Congress--Problems, exercises, etc.
Princeton subject headings:
Online bibliographic searching--Problems, exercises, etc.
Online library catalogs--Subject access--Problems, exercises, etc.
Subject cataloging--Problems, exercises, etc.
Subject headings, Library of Congress--Problems, exercises, etc.