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4 free books about amazon river, free to read online. Chapter 1 of any book is free, no account needed.
Up the Amazon and Madeira rivers, through Bolivia and Peru
Edward D. Mathews
Across the Andes: A tale of wandering days among the mountains of Bolivia and the jungles of the upper Amazon
Charles Johnson Post
Unter Wilden am Amazonas: Forschungen und Abenteuer bei Kopfjägern und Menschenfressern
Charles W. Domville-Fife
Oregon and Eldorado; or, Romance of the Rivers
Thomas Bulfinch