Columbia subject headings:
Libraries--Canada.
Libraries--United States.
Periodicals--Bibliography of bibliographies.
Periodicals--Bibliography--Union lists.
Harvard subject headings:
Bibliographical literature--Bibliography--Periodicals.
Bibliography of bibliographies--Periodicals
Libraries--Canada
Libraries--United States
Periodicals--Bibliography of bibliographies.
Periodicals--Bibliography--Union lists
Princeton subject headings:
Bibliography--Periodicals--Bibliography.
Libraries--Canada.
Libraries--United States.
Periodicals--Bibliography--Union lists.
Union catalogs.