Books about Amazon River Valley

A narrative of travels on the Amazon and Rio Negro, : with an account of the native tribes, and observations on the climate, geology, and natural history of the Amazon valley

Unter Wilden am Amazonas : Forschungen und Abenteuer bei Kopfjägern und Menschenfressern (German)

In the Amazon Jungle : Adventures in Remote Parts of the Upper Amazon River, Including a Sojourn Among Cannibal Indians