Historical clue formulations

• Shelter dug into a hillside — 2013-07-05
• Shelter-providing dugout — 2012-10-06
• Dugout shelter — 2006-12-14
• Shelter dug into a hillside — 2005-10-15
• Dugout shelter — 2000-12-29
• Hillside shelter — 2000-02-15
• Archeological shelter — 1998-01-29
• Rock shelter — 1995-11-02
• Dugout — 1995-10-08
• Shelter: Fr. — 1993-11-27