Columbia subject headings:
Legislative hearings--United States--Indexes.
United States. Congress. Senate--Committees--Indexes.
Harvard subject headings:
Legislative hearings--United States--Indexes.
United States. Congress. Senate--Committees--Indexes.
Unpublished US Senate committee hearings. Supplement, 1965-1968--Indexes
Princeton subject headings:
Indexes.
Legislative hearings--United States--Indexes.
United States. Congress. Senate--Committees--Indexes.