Historical clue formulations

• Arctic explorer Robert — 2019-11-18
• "The North Pole" author, 1910 — 2012-04-27
• "Northward Over the Great Ice" writer — 2010-07-02
• Explorer who proved that Greenland is an island — 2007-10-22
• Arctic explorer Robert — 1999-12-27
• Noted Arctic explorer — 1996-11-07
• _____ Land (northern Greenland) — 1995-03-11
• Admiral in the Arctic — 1994-05-11