Historical clue formulations

• They might fall off a shelf — 2024-08-09
• Icy ocean hazards — 2022-10-03
• Calves come from them — 2020-09-05
• Arctic masses — 2015-09-20
• Little ones are calves — 2013-12-07
• Ross Sea sights — 2013-09-06
• Arctic Circle sights — 2013-04-21
• Baffin Bay sights — 2007-04-29
• Floaters in northern seas — 2006-09-25
• Ice formations — 2006-08-24
• They might scrape bows — 2006-07-08
• Habitats for some seals — 2001-02-18
• Shipping worries — 2001-01-21
• Bow breakers? — 2000-09-16
• Arctic sightings — 1999-09-24
• Frozen mountains — 1995-09-24