Historical clue formulations

• Discoverer of New Zealand — 2016-07-08
• Explorer Abel who discovered New Zealand — 2011-06-16
• New Zealand's discoverer — 2009-11-29
• ___ Sea, west of New Zealand — 2008-11-09
• Discoverer of New Zealand — 2003-03-12
• Dutch explorer with an island named after him — 2002-04-21
• Southern Australia explorer — 2000-08-13
• Discoverer of New Zealand — 2000-01-08
• Eponymous Dutch explorer — 1997-06-07