Columbia subject headings:
Harvard subject headings:
Socialism--United States--History--Sources--Manuscripts--Catalogs.
Tamiment Library.
Working class--United States--History--Sources--Manuscripts--Catalogs.
Princeton subject headings:
Socialism--United States--History--Sources--Manuscripts--Catalogs.
Tamiment Library--Catalogs.
Working class--United States--History--Sources--Manuscripts--Catalogs.