Maps on lining papers.

We shall return -- The vanishing -- The search begins -- Buried treasure -- Blank spots on the map -- The disciple -- Freeze-dried icecream and adrenaline socks -- Into the Amazon -- The secret papers -- The green hell -- Dead Horse Camp -- In the hands of the gods -- Ransom -- The case for Z -- El Dorado -- The locked box -- The whole world is mad -- A scientific obsession -- An unexpected clue -- Have no fear -- The last eyewitness -- Dead or alive -- The colonel's bones -- The other world -- Z.