There is a wealth of literature out there about early Antarctic expeditions and Arctic too. What is "must read" in your opinion?
I'll start it off with two suggestions for the newcomer:
Let Heroes Speak An overview of early expeditions up to 1922 and a good place to start before you decide to find out about any of them in detail.
Alfred Lansings story of Shackleton's Endurance Expedition I am an unashamed Shackleton fan and this is one of the greatest adventure stories of all time - true or otherwise - regardless of the setting. Also available as an
Audiobook which is great for in the car - highly recommended.