Columbia subject headings:
Harvard subject headings:
Economic surveys--Catalogs.
Economics--Public opinion--Catalogs.
Political science--Public opinion--Catalogs.
Politics, Practical--Public opinion--Catalogs.
Social sciences--Public opinion--Catalogs.
Social surveys--Catalogs.
Universität zu Köln. Zentralarchiv für Empirische Sozialforschung--Catalogs.
Princeton subject headings:
Catalogs.
Data centers--Germany (West).
Information storage and retrieval systems--Social sciences.
Social sciences--Bibliography--Catalogs.
Social sciences--Research--Bibliography--Catalogs.