An experiment in literary investigation an experiment in literary investigation / An Experiment in Literary Investigation an experiment in art writing On entrapment in the administrative investigation an empirical investigation an experiment in criticism / The Gulag archipelago 1918-56 :: an experiment in literary investigation / the gulag archipelago 1918-56 :: an experiment in literary investigation / The Gulag Archipelago, 1918-1956 :：an experiment in literary investigation /