Official congressional directory
United States.Congress.
United States.Congress.Joint Committee on Printing.
Washington : G.P.O.,
1888-
Directories for some sessions issued in revised editions.
Vol. for the 73rd Congress, 1st session, has supplement.
Vols. for  compiled under the direction of the Joint Committee on Printing.
United States. Congress
United States. Congress
United States. Congress
Congressional directory