Report of the Select Committee to Investigate Communist Aggression Against Poland, Hungary, Czechoslovakia, Bulgaria, Rumania, Lithuania, Latvia, Estonia, East Germany, Russia, and the Non-Russian Nations of the U.S.S.R.: Second Interim Report to the Select Committee on Communist Aggression, House of Representatives, Eighty-third Congress, Second Session, Under Authority of H. Res. 346 and H. Res. 438