The GULAG Archipelago, Volume 1: An Experiment in Literary Investigation
http://archive.org/details/Gulag_Archipelago_I
The Gulag Archipelago, Volume Two
http://archive.org/details/Gulag_Archipelago_II
The Gulag Archipelago, Volume Three
http://archive.org/details/Gulag_Archipelago_III
Solzhenitsyn: The Voice of Freedom
http://archive.org/details/SolzhenitsynTheVoiceOfFreedom
One Day in the Life of Ivan Denisovich