Anthropology

its frequent presence in pop culture.

The Prose Edda -- the best directly-addressing-the-topic source available -- exists into the modern period only thanks to seven manuscripts(4) or manuscript fragments(3), which even then with that tiny sample size contain variations. We are/were so close to having nothing coherent to work with.

And it isn't long. The Penguin Classics trade paperback on my bookshelf is only 1 cm thick, I just pulled it down to check and it is ~150 pages, end notes and diagrams included.