| Y4 Ad6 | Administrative Review Commission, House 1975-? |
| Y4 Ae8 | Committee on Aeronautical and Space Sciences, Senate |
| Y4 Ag4/2 | Select Committee on Aging, House |
| Y4 Ag8/2 | Committee on Agriculture and Forestry, Senate |
| Y4 Am3/5 | Special Committee to Study Problems of American Small Business, Senate |
| Y4 An5/3 | (mistyping/mislabeling that should be Ar5/3) |
| Y4 As4 | (mistyping/mislabeling that should be Y4 Ag4) |
| Y4 As7 | Select Committee on Assassination, House |
| Y4 As8 | Select Committee on Astronautics and Space Exploration, House |
| Y4 At7/2 | Joint Committee on Atomic Energy |
| Y4 B47 | Joint Committee on the Arrangements for the Commemoration of the Bicentennial |
| Y4 B85 | Joint Budget Control Study Committee |
| Y4 C15 | Special Committee to Investigate Campaign Expenditures, House |
| Y4 C17/2 | Extension of the United States Capitol Commission, 1955 |
| Y4 C33 | Committee on the Census. Senate ca. 1900 |
| Y4 C43/2 | Select Committee on Children, Youth, and Families, House |
| Y4 C49/1 | Civil Service Reform Committee, House |
| Y4 C52/2 | Claims Committee, Senate |
| Y4 C73/2 | Commerce Committee, Senate (1825-1947) |
| Y4 C73/5 | Select Communist Aggression Committee, House (1954) |
| Y4 C73/6 | Select Committee on Committees, House "Energy jurisdictions of house committees." 1980; "Congress and information technology" 1974 |
| Y4 C76/1 | House and Senate Conference Committees. |
| Y4 C76/3 | Joint Committee on the Organization of Congress |
| Y4 C76/7 | Joint Committee on Congressional Operations |
| Y4 C76/8 | Special Official Conduct Committee, Senate |
| Y4 C76/9 | Select Committee on Congressional Operations, House |
| Y4 C86/2 | Special Committee to Investigate Organized Crime in Interstate Commerce, Senate |
| Y4 C86/3 | Select Crime Committee, House |
| Y4 D36 | Joint Committee on Defense Production |
| Y4 D63/1 | Committee on the District of Columbia, House |
| Y4 D63/2 | Committee on the District of Columbia, Senate |
| Y4 D63/3 | Joint Select Committee to Investigate Charities and Reformatory Institutions in the District of Columbia |
| Y4 Ed8/2 | Education Committee, House (1883-1947) |
| Y4 Ed8/3 | Education and Labor Committee, Senate (1885-1947) |
| Y4 Ed8/4 | Select Committee to Investigate Educational and Training Programs under the GI Bill |
| Y4 Eq2 | Select Committee on Equal Educational Opportunity. Senate |
| Y4 Et3/3 | Select Committee on Ethics, House |
| Y4 Et3/4 | Select Committee on Ethics, Senate |
| Y4 Ex3/4 | Special Committee to Investigate Executive Agencies |
| Y4 Ex7/13 | Committee on Expenditures in Executive Departments, House |
| Y4 Ex7/14 | Expenditures in the Executive Department, Senate |
| Y4 Ex7/15 | Select Export Control Committee |
| Y4 F73 | Special Committee to Investigate Food Shortages, House |
| Y4 F76/4 | Joint Forestry Committee |
| Y4 F76/6 | Special Committee to Study Foreign Aid Program, Senate |
| Y4F95 | Special Committee to Investigate the Fuel Situation in the Middle West, Senate |
| Y4 G74/4 | Joint Government Organization Committee |
| Y4 G74/6 | Government Operations Committee, Senate |
| Y4 G74/8 | Select Government Research Committee, Senate |
| Y4 H81/4 | Joint Committee on Housing |
| Y4 H81/5 | Select Committee Pursuant to House Resolution 1 (Adam Clayton Powell), House |
| Y4 H81/6 | Select House Restaurant Committee, House |
| Y4 H88 | Human Resource Committee, Senate |
| Y4 Im6/1 | Immigration and Naturalization Committee, House |
| Y4 Im7 | Select Committee on Improper Activities in Labor or Management Field, Senate |
| Y4 Im7/2 | Impeachment Trial Committee, Senate (198x-????) |
| Y4 In2/1 | Indian Affairs Committee, House |
| Y4 In2/2 | Indian Affairs Committee, Senate |
| Y4 In2/10 | American Indian Policy Review Policy Commission, 1974-? |
| Y4 In2/11 | Select Indian Affairs Committee, Senate |
| Y4 In3 | Information and Facilities Commission, House (1974) |
| Y4 In3/13 | (Federal leasing of petroleum land on the outer continental shelf. 1976. (Congressional Research Service report for Committee on Interior and Insular Affairs, Senate. Probably should be Y4 In8/13: P44. Not located in MC or CIS Index) |
| Y4 In8/2 | Select International Revenue Frauds Committee (1867) |
| Y4 In8/3 | Interstate Commerce Committee; Interstate and Foreign Commerce Committee |
| Y4 In8/4 | Committee on Interstate and Foreign Commerce, House |
| Y4 In8/5 | Invalid Pensions Committee, House |
| Y4 In8/11 | Joint Committee on Internal Revenue Taxation |
| Y4 In8/13 | Committee on Interior and Insular Affairs, Senate |
| Y4 In8/14 | Interior and Insular Affairs Committee, House |
| Y4 In8/15 | Committee on Internal Security, House |
| Y4 In8/17 | Select Committee to Study Government Operations with Respect to Intelligence Activities |
| Y4 In8/20 | Select Committee to Investigate Covert Arms Transactions with Iran |
| Y4 Ir7/2 | Irrigation and Reclamation Committee, House |
| Y4 K15 | Select Committee to Conduct the Investigation on the Facts, Evidence, and Circumstances of the Katyn Massacre, House |
| Y4 L11 | Labor Committee, House |
| Y4 L11/2 | Labor and Public Welfare Committee, Senate |
| Y4 L36 | (Shelf list typographical error, should be Y4 W36:) |
| Y4 L44/2 | Revision of Laws Committee, House |
| Y4 L61/2 | Joint Library Committee |
| Y4 L78/2 | Special Committee to Investigate Lobbying Activities, Senate 1935-1938 |
| Y4 M53 | Committee on Merchant Marine and Fisheries, House |
| Y4 N16 | Select Committee on Narcotics Abuse and Control, House |
| Y4 N95 | Select Committee on Nutrition and Human Needs, Senate |
| Y4 Ol 1 | Select Committee to Investigate Old-Age Pension Plans, House (Letter O, letter l, numeral 1) |
| Y4 Ou8/2 | Select Committee on the Outer Continental Shelf, House |
| Y4 P27/1 | Patents Committee, House |
| Y4 P44 | Select Committee Investigating Petroleum Resources, Senate |
| Y4 P62/4 | Select Committee on Presidential Campaign Activities. ca. 1974 |
| Y4 P63/1 | (Probably a shelf list typographical error, should be Y4 D63/1) |
| Y4 P75 | Special Committee to investigate political activities, lobbying, and campaign contributions, Senate |
| Y4 P76/2 | (Probably a shelf list typographical error, should be (Y4 F76/2) |
| Y4 P81 | Select Committee on Population, House |
| Y4 P84 | Committee on Post Office and Civil Service, House |
| Y4 P84/8 | Select Post-War Military Policy Committee, House |
| Y4 P84/10 | Post Office and Civil Service Committee, House |
| Y4 P84/11 | Post Office and Civil Service Committee, Senate; Government Affairs Committee, Senate |
| Y4 P92/4 | Select Committee on Presidential Campaign Activities of the U.S., Senate |
| Y4 P93 | (Probably a locally created classification number, used with a Joint Printing Committee publication of 1907). |
| Y4 P93/1 | Joint Printing Committee |
| Y4 P93/6 | Privileges and Elections Committee, Senate |
| Y4 P96/1 | Public Lands Committee, Senate; Interior and Insular Affairs Committee, Senate; Energy and Natural Resources Committee, Senate |
| Y4 P96/2 | Committee on Public Lands, House |
| Y4 P96/6 | Public Buildings and Grounds Committee, House |
| Y4 P96/11 | Committee on Public Works, House |
| Y4 R13/3 | Joint Committee on Railroad Retirement |
| Y4 R24/4 | Joint Committee on Reduction of Non-essential Expenditures; Joint Committee on Reduction of Federal Expenditures |
| Y4 R52 | Rivers and Harbors Committee, House |
| Y4 R53/2 | Roads Committee, House |
| Y4 Se5 | Contingent Expenses Committee, Senate |
| Y4 Sp1 | Special Space and Astronautics Committee, Senate |
| Y4 Sp6 | Select Professional Sports Committee, House |
| Y4 St2/2 | Select Standards and Conduct Committee, Senate |
| Y4 St2/3 | Committee on Standards of Official Conduct, House |
| Y4 Uk7 | (Should be Y3 Uk7) |
| Y4 Un1/2 | Committee on Un-American Activities, House |
| Y4 V64/8 | (Shelf list typographical error, should be Y4 V68/3) |