Minecraft wiki entry for History_of_world_generation, associated text: The seed Glacier in Beta 1.7.3.
The seed Glacier in Beta 1.8.
The seed Glacier in 1.0.0.
The seed Glacier in 1.2.5.
The seed Glacier in 1.6.4. Very minor differences.
The seed Glacier in 1.7.2.
The seed Glacier in 1.15.2.
The seed Glacier in 1.18 Experimental Snapshot 1, the first Glacier seed to actually generates glaciers at spawn.
The seed Glacier in 1.18 experimental snapshot 2.
The seed Glacier in 1.18 experimental snapshot 5.
The seed Glacier in 1.12.2 with the "Neo-Beta" Old Customized preset.