Q. Where can I find information on dates of congressional sessions?

U.S. Senate website:

Years of the 1st through 112th Congresses (1789-2012)

Dates of Sessions of the Congress, present-1789 or (1789-present)

U.S. House of Representatives (Office of the Clerk):

Sessions Dates of Congress:   The Sessions of Congress table published annually in the Congressional Directory, under the heading "Statistical Information". The Congressional Directory is an electronic publication that is available and searchable through the FDsys: US Government Printing Office's Federal Digital System.