Historical clue formulations

• Stalin-era labor camp — 2016-01-06
• Soviet labor camp — 2015-10-11
• Place bereft of happy campers? — 2015-05-16
• Solzhenitsyn novel setting — 2012-09-09
• Solzhenitsyn's "The ___ Archipelago" — 2011-11-28
• Solzhenitsyn subject — 2011-04-17
• Solzhenitsyn topic — 2010-01-31
• Soviet labor camp — 2009-01-13
• Soviet labor camp — 2007-07-04
• Bygone prison — 2004-10-07
• Solzhenitsyn novel setting — 2002-09-22
• Soviet labor camp — 1997-01-06