Icebreaker Mackinaw Maritime Museum, From Wikipedia: USCGC…
Kontio (icebreaker) - Wikipedia
Wind-class icebreaker, Military Wiki
Baltika (icebreaker) - Wikipedia
Murtaja (1890 icebreaker) - Wikipedia
HMS Endurance (A171) - Wikipedia
Ice Breakers candy - Wikipedia
Icebreaker, Dynamic Ship Simulator III Wiki
Atle-class icebreaker - Wikipedia
Eisvogel (1942 icebreaker) - Wikipedia
Krassin (1916 icebreaker) - Wikipedia