The Official Congressional Directory is the official directory of the United States Congress, prepared by the Joint Committee on Printing (JCP) and published by the United States Government Printing Office (GPO) since 1887. Directories since the 41st Congress (1869–1871) are available online from the Government Publishing Office. Per federal statute the Directory is published and distributed during the first session of each new Congress. It is a designated essential title distributed to Federal depository libraries and the current edition is available for purchase from GPO.