Is there a way to access these old docs?

I’m interested in these concept docs shown here: (30 minutes mark)

Actually any doc really, both for curiosity and to reclaim some old ideas. For example, before the arctic biome being officially released, I had a prototype similar to that drawing with an ice wall/cliff into deep water. I’m thinking that icebergs and ice masses in the water could be easily done now with landmarks and those fire sprites nest in volcanos would be cute, even if just as simple enemies (the entling equivalent for the arctic)