Leiber, Fritz -- Swords Against Wizardry (Nehwon 4)
Leiber must have gotten excited about mountaineering, because a good
third of this book is Fafhrd and the Mouser climbing a mountain, in
detail. (Naturally, they take a break halfway to bed some magical
princesses, then fight a duel at the top.) (Not with each other.)
Later they get involved in politics in some underground empire.
Books I have acquired recently
All the books I own